parser

package
v0.0.0-...-f211112 Latest Latest
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 Go to latest Published: Jan 31, 2016 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Index

Constants

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const (
	Distinct funcType
	All
)

FuncExpr.Type

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const ACTION = 57358
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const ADD = 57359
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const ALL = 57360
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const ALTER = 57361
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const ANALYSE = 57362
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const ANALYZE = 57363
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const AND = 57364
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const ANY = 57365
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const ARRAY = 57366
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const AS = 57367
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const ASC = 57368
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const ASYMMETRIC = 57369
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const AT = 57370
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const BCONST = 57349
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const BEGIN = 57371
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const BETWEEN = 57372
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const BIGINT = 57373
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const BIT = 57374
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const BLOB = 57375
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const BOOL = 57376
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const BOOLEAN = 57377
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const BOTH = 57378
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const BY = 57379
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const BYTES = 57380
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const CASCADE = 57381
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const CASE = 57382
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const CAST = 57383
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const CHAR = 57384
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const CHARACTER = 57385
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const CHECK = 57386
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const COALESCE = 57387
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const COLLATE = 57388
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const COLLATION = 57389
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const COLUMN = 57390
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const COLUMNS = 57391
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const COMMIT = 57392
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const COMMITTED = 57393
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const CONCAT = 57394
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const CONFLICT = 57395
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const CONSTRAINT = 57396
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const COVERING = 57397
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const CREATE = 57398
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const CROSS = 57399
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const CUBE = 57400
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const CURRENT = 57401
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const CURRENT_CATALOG = 57402
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const CURRENT_DATE = 57403
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const CURRENT_ROLE = 57404
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const CURRENT_TIME = 57405
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const CURRENT_TIMESTAMP = 57406
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const CURRENT_USER = 57407
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const CYCLE = 57408
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const DATA = 57409
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const DATABASE = 57410
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const DATABASES = 57411
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const DATE = 57412
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const DAY = 57413
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const DEC = 57414
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const DECIMAL = 57415
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const DEFAULT = 57416
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const DEFERRABLE = 57417
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const DELETE = 57418
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const DESC = 57419
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const DISTINCT = 57420
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const DO = 57421
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const DOT_DOT = 57353
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const DOUBLE = 57422
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const DROP = 57423
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const ELSE = 57424
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const END = 57425
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const ERROR = 57357
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const ESCAPE = 57426
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const EXCEPT = 57427
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const EXISTS = 57428
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const EXPLAIN = 57429
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const EXTRACT = 57430
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const FALSE = 57431
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const FCONST = 57347
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const FETCH = 57432
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const FILTER = 57433
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const FIRST = 57434
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const FLOAT = 57435
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const FOLLOWING = 57436
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const FOR = 57437
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const FOREIGN = 57438
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const FROM = 57439
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const FULL = 57440
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const GRANT = 57441
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const GRANTS = 57442
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const GREATER_EQUALS = 57355
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const GREATEST = 57443
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const GROUP = 57444
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const GROUPING = 57445
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const HAVING = 57446
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const HIGH = 57447
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const HOUR = 57448
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const ICONST = 57350
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const IDENT = 57346
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const IF = 57449
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const IFNULL = 57450
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const IN = 57451
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const INDEX = 57452
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const INITIALLY = 57453
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const INNER = 57454
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const INSERT = 57455
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const INT = 57456
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const INT64 = 57457
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const INTEGER = 57458
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const INTERSECT = 57459
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const INTERVAL = 57460
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const INTO = 57461
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const IS = 57462
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const ISOLATION = 57463
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const JOIN = 57464
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const KEY = 57465
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const LATERAL = 57466
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const LEADING = 57467
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const LEAST = 57468
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const LEFT = 57469
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const LESS_EQUALS = 57354
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const LEVEL = 57470
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const LIKE = 57471
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const LIMIT = 57472
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const LOCAL = 57473
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const LOCALTIME = 57474
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const LOCALTIMESTAMP = 57475
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const LOW = 57476
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const LSHIFT = 57477
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const MATCH = 57478
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const MINUTE = 57479
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const MONTH = 57480
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const NAME = 57481
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const NAMES = 57482
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const NATURAL = 57483
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const NEXT = 57484
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const NO = 57485
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const NORMAL = 57486
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const NOT = 57487
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const NOTHING = 57488
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const NOT_EQUALS = 57356
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const NOT_LA = 57588
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const NULL = 57489
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const NULLIF = 57490
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const NULLS = 57491
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const NUMERIC = 57492
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const OF = 57493
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const OFF = 57494
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const OFFSET = 57495
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const ON = 57496
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const ONLY = 57497
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const OR = 57498
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const ORDER = 57499
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const ORDINALITY = 57500
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const OUT = 57501
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const OUTER = 57502
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const OVER = 57503
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const OVERLAPS = 57504
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const OVERLAY = 57505
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const PARAM = 57351
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const PARTIAL = 57506
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const PARTITION = 57507
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const PLACING = 57508
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const POSITION = 57509
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const POSTFIXOP = 57590
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const PRECEDING = 57510
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const PRECISION = 57511
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const PRIMARY = 57512
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const PRIORITY = 57513
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const RANGE = 57514
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const READ = 57515
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const REAL = 57516
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const RECURSIVE = 57517
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const REF = 57518
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const REFERENCES = 57519
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const RENAME = 57520
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const REPEATABLE = 57521
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const RESTRICT = 57522
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const RETURNING = 57523
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const REVOKE = 57524
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const RIGHT = 57525
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const ROLLBACK = 57526
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const ROLLUP = 57527
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const ROW = 57528
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const ROWS = 57529
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const RSHIFT = 57530
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const SCONST = 57348
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const SEARCH = 57531
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const SECOND = 57532
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const SELECT = 57533
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const SERIALIZABLE = 57534
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const SESSION = 57535
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const SESSION_USER = 57536
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const SET = 57537
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const SHOW = 57538
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const SIMILAR = 57539
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const SIMPLE = 57540
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const SMALLINT = 57541
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const SNAPSHOT = 57542
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const SOME = 57543
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const SQL = 57544
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const START = 57545
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const STORING = 57548
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const STRICT = 57546
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const STRING = 57547
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const SUBSTRING = 57549
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const SYMMETRIC = 57550
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const TABLE = 57551
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const TABLES = 57552
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const TEXT = 57553
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const THEN = 57554
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const TIME = 57555
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const TIMESTAMP = 57556
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const TO = 57557
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const TRAILING = 57558
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const TRANSACTION = 57559
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const TREAT = 57560
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const TRIM = 57561
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const TRUE = 57562
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const TRUNCATE = 57563
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const TYPE = 57564
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const TYPECAST = 57352
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const (
	TimestampWithOffsetZoneFormat = "2006-01-02 15:04:05.999999999-07:00"
)

time.Time formats.

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const UMINUS = 57591
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const UNBOUNDED = 57565
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const UNCOMMITTED = 57566
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const UNION = 57567
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const UNIQUE = 57568
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const UNKNOWN = 57569
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const UPDATE = 57570
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const USER = 57571
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const USING = 57572
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const VALID = 57573
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const VALIDATE = 57574
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const VALUE = 57575
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const VALUES = 57576
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const VARCHAR = 57577
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const VARIADIC = 57578
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const VARYING = 57579
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const WHEN = 57580
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const WHERE = 57581
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const WINDOW = 57582
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const WITH = 57583
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const WITHIN = 57584
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const WITHOUT = 57585
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const WITH_LA = 57589
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const YEAR = 57586
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const ZONE = 57587

Variables

This section is empty.

Functions

func ContainsVars 

func ContainsVars(expr Expr) bool

ContainsVars returns true if the expression contains any variables.

func FillArgs 

func FillArgs(stmt Statement, args Args) error

FillArgs replaces any placeholder nodes in the expression with arguments supplied with the query.

func SimilarEscape 

func SimilarEscape(pattern string) string

SimilarEscape converts a SQL:2008 regexp pattern to POSIX style, so it can be used by our regexp engine.

func WalkStmt 

func WalkStmt(v Visitor, stmt Statement)

WalkStmt walks the entire parsed stmt calling WalkExpr on each expression, and replacing each expression with the one returned by WalkExpr.

Types

type AliasedTableExpr 

type AliasedTableExpr struct {
	Expr SimpleTableExpr
	As   Name
}

AliasedTableExpr represents a table expression coupled with an optional alias.

func (*AliasedTableExpr) String 

func (node *AliasedTableExpr) String() string

type AlterTable 

type AlterTable struct {
	IfExists bool
	Table    *QualifiedName
	Cmds     AlterTableCmds
}

AlterTable represents an ALTER TABLE statement.

func (*AlterTable) StatementType 

func (*AlterTable) StatementType() StatementType

StatementType implements the Statement interface.

func (*AlterTable) String 

func (node *AlterTable) String() string

type AlterTableAddColumn 

type AlterTableAddColumn struct {
	IfNotExists bool
	ColumnDef   *ColumnTableDef
	// contains filtered or unexported fields
}

AlterTableAddColumn represents an ADD COLUMN command.

func (*AlterTableAddColumn) String 

func (node *AlterTableAddColumn) String() string

type AlterTableAddConstraint 

type AlterTableAddConstraint struct {
	ConstraintDef ConstraintTableDef
}

AlterTableAddConstraint represents an ADD CONSTRAINT command.

func (*AlterTableAddConstraint) String 

func (node *AlterTableAddConstraint) String() string

type AlterTableCmd 

type AlterTableCmd interface {
	// contains filtered or unexported methods
}

AlterTableCmd represents a table modification operation.

type AlterTableCmds 

type AlterTableCmds []AlterTableCmd

AlterTableCmds represents a list of table alterations.

func (AlterTableCmds) String 

func (node AlterTableCmds) String() string

type AlterTableDropColumn 

type AlterTableDropColumn struct {
	IfExists bool
	Column   string
	// contains filtered or unexported fields
}

AlterTableDropColumn represents a DROP COLUMN command.

func (*AlterTableDropColumn) String 

func (node *AlterTableDropColumn) String() string

type AlterTableDropConstraint 

type AlterTableDropConstraint struct {
	IfExists   bool
	Constraint string
}

AlterTableDropConstraint represents a DROP CONSTRAINT command.

func (*AlterTableDropConstraint) String 

func (node *AlterTableDropConstraint) String() string

type AndExpr 

type AndExpr struct {
	Left, Right Expr
}

AndExpr represents an AND expression.

func (*AndExpr) Eval 

func (expr *AndExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*AndExpr) String 

func (node *AndExpr) String() string

func (*AndExpr) TypeCheck 

func (expr *AndExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*AndExpr) Walk 

func (expr *AndExpr) Walk(v Visitor)

Walk implements the Expr interface.

type Args 

type Args interface {
	Arg(name string) (Datum, bool)
}

Args defines the interface for retrieving arguments. Return false for the second return value if the argument cannot be found.

type Array 

type Array Exprs

Array represents an array constructor.

func (Array) Eval 

func (t Array) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (Array) String 

func (node Array) String() string

func (Array) TypeCheck 

func (expr Array) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (Array) Walk 

func (expr Array) Walk(v Visitor)

Walk implements the Expr interface.

type ArrayIndirection 

type ArrayIndirection struct {
	Begin Expr
	End   Expr
}

ArrayIndirection represents "[<begin>:<end>]" in an indirection expression.

func (*ArrayIndirection) String 

func (a *ArrayIndirection) String() string

type BeginTransaction 

type BeginTransaction struct {
	Isolation    IsolationLevel
	UserPriority UserPriority
}

BeginTransaction represents a BEGIN statement

func (*BeginTransaction) StatementType 

func (*BeginTransaction) StatementType() StatementType

StatementType implements the Statement interface.

func (*BeginTransaction) String 

func (node *BeginTransaction) String() string

type BinaryExpr 

type BinaryExpr struct {
	Operator    BinaryOp
	Left, Right Expr
	// contains filtered or unexported fields
}

BinaryExpr represents a binary value expression.

func (*BinaryExpr) Eval 

func (expr *BinaryExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*BinaryExpr) String 

func (node *BinaryExpr) String() string

func (*BinaryExpr) TypeCheck 

func (expr *BinaryExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*BinaryExpr) Walk 

func (expr *BinaryExpr) Walk(v Visitor)

Walk implements the Expr interface.

type BinaryOp 

type BinaryOp int

BinaryOp represents a binary operator. 

const (
	Bitand BinaryOp = iota
	Bitor
	Bitxor
	Plus
	Minus
	Mult
	Div
	Mod
	Concat
	LShift
	RShift
)

BinaryExpr.Operator

func (BinaryOp) String 

func (i BinaryOp) String() string

type BoolType 

type BoolType struct {
	Name string
}

BoolType represents a BOOLEAN type.

func (*BoolType) String 

func (node *BoolType) String() string

type BytesType 

type BytesType struct {
	Name string
}

BytesType represents a BYTES or BLOB type.

func (*BytesType) String 

func (node *BytesType) String() string

type CaseExpr 

type CaseExpr struct {
	Expr  Expr
	Whens []*When
	Else  Expr
}

CaseExpr represents a CASE expression.

func (*CaseExpr) Eval 

func (expr *CaseExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*CaseExpr) String 

func (node *CaseExpr) String() string

func (*CaseExpr) TypeCheck 

func (expr *CaseExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*CaseExpr) Walk 

func (expr *CaseExpr) Walk(v Visitor)

Walk implements the Expr interface.

type CastExpr 

type CastExpr struct {
	Expr Expr
	Type ColumnType
}

CastExpr represents a CAST(expr AS type) expression.

func (*CastExpr) Eval 

func (expr *CastExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*CastExpr) String 

func (n *CastExpr) String() string

func (*CastExpr) TypeCheck 

func (expr *CastExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*CastExpr) Walk 

func (expr *CastExpr) Walk(v Visitor)

Walk implements the Expr interface.

type CoalesceExpr 

type CoalesceExpr struct {
	Name  string
	Exprs Exprs
}

CoalesceExpr represents a COALESCE or IFNULL expression.

func (*CoalesceExpr) Eval 

func (expr *CoalesceExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*CoalesceExpr) String 

func (node *CoalesceExpr) String() string

func (*CoalesceExpr) TypeCheck 

func (expr *CoalesceExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*CoalesceExpr) Walk 

func (expr *CoalesceExpr) Walk(v Visitor)

Walk implements the Expr interface.

type ColumnDefault 

type ColumnDefault struct {
	Expr Expr
}

ColumnDefault represents a DEFAULT clause for a column.

type ColumnQualification 

type ColumnQualification interface {
	// contains filtered or unexported methods
}

ColumnQualification represents a constraint on a column.

type ColumnTableDef 

type ColumnTableDef struct {
	Name        Name
	Type        ColumnType
	Nullable    Nullability
	PrimaryKey  bool
	Unique      bool
	DefaultExpr Expr
}

ColumnTableDef represents a column definition within a CREATE TABLE statement.

func (*ColumnTableDef) String 

func (node *ColumnTableDef) String() string

type ColumnType 

type ColumnType interface {
	fmt.Stringer
	// contains filtered or unexported methods
}

ColumnType represents a type in a column definition.

type CommitTransaction 

type CommitTransaction struct{}

CommitTransaction represents a COMMIT statement.

func (*CommitTransaction) StatementType 

func (*CommitTransaction) StatementType() StatementType

StatementType implements the Statement interface.

func (*CommitTransaction) String 

func (node *CommitTransaction) String() string

type ComparisonExpr 

type ComparisonExpr struct {
	Operator    ComparisonOp
	Left, Right Expr
	// contains filtered or unexported fields
}

ComparisonExpr represents a two-value comparison expression.

func (*ComparisonExpr) Eval 

func (expr *ComparisonExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*ComparisonExpr) String 

func (node *ComparisonExpr) String() string

func (*ComparisonExpr) TypeCheck 

func (expr *ComparisonExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*ComparisonExpr) Walk 

func (expr *ComparisonExpr) Walk(v Visitor)

Walk implements the Expr interface.

type ComparisonOp 

type ComparisonOp int

ComparisonOp represents a binary operator. 

const (
	EQ ComparisonOp = iota
	LT
	GT
	LE
	GE
	NE
	In
	NotIn
	Like
	NotLike
	SimilarTo
	NotSimilarTo
	IsDistinctFrom
	IsNotDistinctFrom
	Is
	IsNot
)

ComparisonExpr.Operator

func (ComparisonOp) String 

func (i ComparisonOp) String() string

type ConstraintTableDef 

type ConstraintTableDef interface {
	TableDef
	// contains filtered or unexported methods
}

ConstraintTableDef represents a constraint definition within a CREATE TABLE statement.

type CreateDatabase 

type CreateDatabase struct {
	IfNotExists bool
	Name        Name
}

CreateDatabase represents a CREATE DATABASE statement.

func (*CreateDatabase) StatementType 

func (*CreateDatabase) StatementType() StatementType

StatementType implements the Statement interface.

func (*CreateDatabase) String 

func (node *CreateDatabase) String() string

type CreateIndex 

type CreateIndex struct {
	Name        Name
	Table       *QualifiedName
	Unique      bool
	IfNotExists bool
	Columns     IndexElemList
	// Extra columns to be stored together with the indexed ones as an optimization
	// for improved reading performance.
	Storing NameList
}

CreateIndex represents a CREATE INDEX statement.

func (*CreateIndex) StatementType 

func (*CreateIndex) StatementType() StatementType

StatementType implements the Statement interface.

func (*CreateIndex) String 

func (node *CreateIndex) String() string

type CreateTable 

type CreateTable struct {
	IfNotExists bool
	Table       *QualifiedName
	Defs        TableDefs
}

CreateTable represents a CREATE TABLE statement.

func (*CreateTable) StatementType 

func (*CreateTable) StatementType() StatementType

StatementType implements the Statement interface.

func (*CreateTable) String 

func (node *CreateTable) String() string

type DBool 

type DBool bool

DBool is the boolean Datum.

func GetBool 

func GetBool(d Datum) (DBool, error)

GetBool gets DBool or an error (also treats NULL as false, not an error).

func (DBool) Compare 

func (d DBool) Compare(other Datum) int

Compare implements the Datum interface.

func (DBool) Eval 

func (t DBool) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DBool) HasNext 

func (d DBool) HasNext() bool

HasNext implements the Datum interface.

func (DBool) HasPrev 

func (d DBool) HasPrev() bool

HasPrev implements the Datum interface.

func (DBool) IsMax 

func (d DBool) IsMax() bool

IsMax implements the Datum interface.

func (DBool) IsMin 

func (d DBool) IsMin() bool

IsMin implements the Datum interface.

func (DBool) Next 

func (d DBool) Next() Datum

Next implements the Datum interface.

func (DBool) Prev 

func (d DBool) Prev() Datum

Prev implements the Datum interface.

func (DBool) String 

func (d DBool) String() string

func (DBool) Type 

func (d DBool) Type() string

Type implements the Datum interface.

func (DBool) TypeCheck 

func (expr DBool) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DBool) Walk 

func (DBool) Walk(_ Visitor)

Walk implements the Expr interface.

type DBytes 

type DBytes string

DBytes is the bytes Datum. The underlying type is a string because we want the immutability, but this may contain arbitrary bytes.

func (DBytes) Compare 

func (d DBytes) Compare(other Datum) int

Compare implements the Datum interface.

func (DBytes) Eval 

func (t DBytes) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DBytes) HasNext 

func (d DBytes) HasNext() bool

HasNext implements the Datum interface.

func (DBytes) HasPrev 

func (d DBytes) HasPrev() bool

HasPrev implements the Datum interface.

func (DBytes) IsMax 

func (d DBytes) IsMax() bool

IsMax implements the Datum interface.

func (DBytes) IsMin 

func (d DBytes) IsMin() bool

IsMin implements the Datum interface.

func (DBytes) Next 

func (d DBytes) Next() Datum

Next implements the Datum interface.

func (DBytes) Prev 

func (d DBytes) Prev() Datum

Prev implements the Datum interface.

func (DBytes) String 

func (d DBytes) String() string

func (DBytes) Type 

func (d DBytes) Type() string

Type implements the Datum interface.

func (DBytes) TypeCheck 

func (expr DBytes) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DBytes) Walk 

func (DBytes) Walk(_ Visitor)

Walk implements the Expr interface.

type DDate 

type DDate int64

DDate is the date Datum represented as the number of days after the Unix epoch.

func ParseDate 

func ParseDate(s DString) (DDate, error)

ParseDate parses a date.

func (DDate) Compare 

func (d DDate) Compare(other Datum) int

Compare implements the Datum interface.

func (DDate) Eval 

func (t DDate) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DDate) HasNext 

func (d DDate) HasNext() bool

HasNext implements the Datum interface.

func (DDate) HasPrev 

func (d DDate) HasPrev() bool

HasPrev implements the Datum interface.

func (DDate) IsMax 

func (d DDate) IsMax() bool

IsMax implements the Datum interface.

func (DDate) IsMin 

func (d DDate) IsMin() bool

IsMin implements the Datum interface.

func (DDate) Next 

func (d DDate) Next() Datum

Next implements the Datum interface.

func (DDate) Prev 

func (d DDate) Prev() Datum

Prev implements the Datum interface.

func (DDate) String 

func (d DDate) String() string

func (DDate) Type 

func (d DDate) Type() string

Type implements the Datum interface.

func (DDate) TypeCheck 

func (expr DDate) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DDate) Walk 

func (DDate) Walk(_ Visitor)

Walk implements the Expr interface.

type DDecimal 

type DDecimal struct {
	decimal.Decimal
}

DDecimal is the decimal Datum.

func (DDecimal) Compare 

func (d DDecimal) Compare(other Datum) int

Compare implements the Datum interface.

func (DDecimal) Eval 

func (t DDecimal) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DDecimal) HasNext 

func (d DDecimal) HasNext() bool

HasNext implements the Datum interface.

func (DDecimal) HasPrev 

func (d DDecimal) HasPrev() bool

HasPrev implements the Datum interface.

func (DDecimal) IsMax 

func (d DDecimal) IsMax() bool

IsMax implements the Datum interface.

func (DDecimal) IsMin 

func (d DDecimal) IsMin() bool

IsMin implements the Datum interface.

func (DDecimal) Next 

func (d DDecimal) Next() Datum

Next implements the Datum interface.

func (DDecimal) Prev 

func (d DDecimal) Prev() Datum

Prev implements the Datum interface.

func (DDecimal) String 

func (d DDecimal) String() string

func (DDecimal) Type 

func (d DDecimal) Type() string

Type implements the Datum interface.

func (DDecimal) TypeCheck 

func (expr DDecimal) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DDecimal) Walk 

func (DDecimal) Walk(_ Visitor)

Walk implements the Expr interface.

type DFloat 

type DFloat float64

DFloat is the float Datum.

func (DFloat) Compare 

func (d DFloat) Compare(other Datum) int

Compare implements the Datum interface.

func (DFloat) Eval 

func (t DFloat) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DFloat) HasNext 

func (d DFloat) HasNext() bool

HasNext implements the Datum interface.

func (DFloat) HasPrev 

func (d DFloat) HasPrev() bool

HasPrev implements the Datum interface.

func (DFloat) IsMax 

func (d DFloat) IsMax() bool

IsMax implements the Datum interface.

func (DFloat) IsMin 

func (d DFloat) IsMin() bool

IsMin implements the Datum interface.

func (DFloat) Next 

func (d DFloat) Next() Datum

Next implements the Datum interface.

func (DFloat) Prev 

func (d DFloat) Prev() Datum

Prev implements the Datum interface.

func (DFloat) String 

func (d DFloat) String() string

func (DFloat) Type 

func (d DFloat) Type() string

Type implements the Datum interface.

func (DFloat) TypeCheck 

func (expr DFloat) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DFloat) Walk 

func (DFloat) Walk(_ Visitor)

Walk implements the Expr interface.

type DInt 

type DInt int64

DInt is the int Datum.

func (DInt) Compare 

func (d DInt) Compare(other Datum) int

Compare implements the Datum interface.

func (DInt) Eval 

func (t DInt) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DInt) HasNext 

func (d DInt) HasNext() bool

HasNext implements the Datum interface.

func (DInt) HasPrev 

func (d DInt) HasPrev() bool

HasPrev implements the Datum interface.

func (DInt) IsMax 

func (d DInt) IsMax() bool

IsMax implements the Datum interface.

func (DInt) IsMin 

func (d DInt) IsMin() bool

IsMin implements the Datum interface.

func (DInt) Next 

func (d DInt) Next() Datum

Next implements the Datum interface.

func (DInt) Prev 

func (d DInt) Prev() Datum

Prev implements the Datum interface.

func (DInt) String 

func (d DInt) String() string

func (DInt) Type 

func (d DInt) Type() string

Type implements the Datum interface.

func (DInt) TypeCheck 

func (expr DInt) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DInt) Walk 

func (DInt) Walk(_ Visitor)

Walk implements the Expr interface.

type DInterval 

type DInterval struct {
	time.Duration
}

DInterval is the interval Datum.

func (DInterval) Compare 

func (d DInterval) Compare(other Datum) int

Compare implements the Datum interface.

func (DInterval) Eval 

func (t DInterval) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DInterval) HasNext 

func (d DInterval) HasNext() bool

HasNext implements the Datum interface.

func (DInterval) HasPrev 

func (d DInterval) HasPrev() bool

HasPrev implements the Datum interface.

func (DInterval) IsMax 

func (d DInterval) IsMax() bool

IsMax implements the Datum interface.

func (DInterval) IsMin 

func (d DInterval) IsMin() bool

IsMin implements the Datum interface.

func (DInterval) Next 

func (d DInterval) Next() Datum

Next implements the Datum interface.

func (DInterval) Prev 

func (d DInterval) Prev() Datum

Prev implements the Datum interface.

func (DInterval) Type 

func (d DInterval) Type() string

Type implements the Datum interface.

func (DInterval) TypeCheck 

func (expr DInterval) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DInterval) Walk 

func (DInterval) Walk(_ Visitor)

Walk implements the Expr interface.

type DString 

type DString string

DString is the string Datum.

func (DString) Compare 

func (d DString) Compare(other Datum) int

Compare implements the Datum interface.

func (DString) Eval 

func (t DString) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DString) HasNext 

func (d DString) HasNext() bool

HasNext implements the Datum interface.

func (DString) HasPrev 

func (d DString) HasPrev() bool

HasPrev implements the Datum interface.

func (DString) IsMax 

func (d DString) IsMax() bool

IsMax implements the Datum interface.

func (DString) IsMin 

func (d DString) IsMin() bool

IsMin implements the Datum interface.

func (DString) Next 

func (d DString) Next() Datum

Next implements the Datum interface.

func (DString) Prev 

func (d DString) Prev() Datum

Prev implements the Datum interface.

func (DString) String 

func (d DString) String() string

func (DString) Type 

func (d DString) Type() string

Type implements the Datum interface.

func (DString) TypeCheck 

func (expr DString) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DString) Walk 

func (DString) Walk(_ Visitor)

Walk implements the Expr interface.

type DTimestamp 

type DTimestamp struct {
	time.Time
}

DTimestamp is the timestamp Datum.

func (DTimestamp) Compare 

func (d DTimestamp) Compare(other Datum) int

Compare implements the Datum interface.

func (DTimestamp) Eval 

func (t DTimestamp) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DTimestamp) HasNext 

func (d DTimestamp) HasNext() bool

HasNext implements the Datum interface.

func (DTimestamp) HasPrev 

func (d DTimestamp) HasPrev() bool

HasPrev implements the Datum interface.

func (DTimestamp) IsMax 

func (d DTimestamp) IsMax() bool

IsMax implements the Datum interface.

func (DTimestamp) IsMin 

func (d DTimestamp) IsMin() bool

IsMin implements the Datum interface.

func (DTimestamp) Next 

func (d DTimestamp) Next() Datum

Next implements the Datum interface.

func (DTimestamp) Prev 

func (d DTimestamp) Prev() Datum

Prev implements the Datum interface.

func (DTimestamp) String 

func (d DTimestamp) String() string

func (DTimestamp) Type 

func (d DTimestamp) Type() string

Type implements the Datum interface.

func (DTimestamp) TypeCheck 

func (expr DTimestamp) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DTimestamp) Walk 

func (DTimestamp) Walk(_ Visitor)

Walk implements the Expr interface.

type DTuple 

type DTuple []Datum

DTuple is the tuple Datum.

func (DTuple) Compare 

func (d DTuple) Compare(other Datum) int

Compare implements the Datum interface.

func (DTuple) Eval 

func (t DTuple) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DTuple) HasNext 

func (d DTuple) HasNext() bool

HasNext implements the Datum interface.

func (DTuple) HasPrev 

func (d DTuple) HasPrev() bool

HasPrev implements the Datum interface.

func (DTuple) IsMax 

func (d DTuple) IsMax() bool

IsMax implements the Datum interface.

func (DTuple) IsMin 

func (d DTuple) IsMin() bool

IsMin implements the Datum interface.

func (DTuple) Len 

func (d DTuple) Len() int

func (DTuple) Less 

func (d DTuple) Less(i, j int) bool

func (DTuple) Next 

func (d DTuple) Next() Datum

Next implements the Datum interface.

func (*DTuple) Normalize 

func (d *DTuple) Normalize()

Normalize sorts and uniques the datum tuple.

func (DTuple) Prev 

func (d DTuple) Prev() Datum

Prev implements the Datum interface.

func (DTuple) String 

func (d DTuple) String() string

func (DTuple) Swap 

func (d DTuple) Swap(i, j int)

func (DTuple) Type 

func (d DTuple) Type() string

Type implements the Datum interface.

func (DTuple) TypeCheck 

func (expr DTuple) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DTuple) Walk 

func (DTuple) Walk(_ Visitor)

Walk implements the Expr interface.

type DValArg 

type DValArg struct {
	// contains filtered or unexported fields
}

DValArg is the named bind var argument Datum.

func (DValArg) Compare 

func (d DValArg) Compare(other Datum) int

Compare implements the Datum interface.

func (DValArg) Eval 

func (t DValArg) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DValArg) HasNext 

func (d DValArg) HasNext() bool

HasNext implements the Datum interface.

func (DValArg) HasPrev 

func (d DValArg) HasPrev() bool

HasPrev implements the Datum interface.

func (DValArg) IsMax 

func (DValArg) IsMax() bool

IsMax implements the Datum interface.

func (DValArg) IsMin 

func (DValArg) IsMin() bool

IsMin implements the Datum interface.

func (DValArg) Next 

func (d DValArg) Next() Datum

Next implements the Datum interface.

func (DValArg) Prev 

func (d DValArg) Prev() Datum

Prev implements the Datum interface.

func (DValArg) String 

func (d DValArg) String() string

func (DValArg) Type 

func (DValArg) Type() string

Type implements the Datum interface.

func (DValArg) TypeCheck 

func (expr DValArg) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DValArg) Variable 

func (DValArg) Variable()

Variable implements the VariableExpr interface.

func (DValArg) Walk 

func (DValArg) Walk(_ Visitor)

Walk implements the Expr interface.

type DateType 

type DateType struct {
}

DateType represents a DATE type.

func (*DateType) String 

func (node *DateType) String() string

type Datum 

type Datum interface {
	Expr
	Type() string
	// Compare returns -1 if the receiver is less than other, 0 if receiver is
	// equal to other and +1 if receiver is greater than other.
	Compare(other Datum) int
	// HasPrev specifies if Prev() can be used to compute a previous value for
	// a datum. For example, DBytes doesn't support it (the previous for BB is BAZZZ..).
	HasPrev() bool
	// Prev returns the previous datum. If the receiver is "b" and the returned datum
	// is "a", then "a < b" and no other datum will compare such that "a < c <
	// b".
	// The return value is undefined if `IsMin()`.
	Prev() Datum
	// HasNext specifies if Next() can be used to compute a next value for a
	// datum. For example, DDecimal doesn't support it (the next for 1.0 is 1.00..1).
	HasNext() bool
	// Next returns the next datum. If the receiver is "a" and the returned datum
	// is "b", then "a < b" and no other datum will compare such that "a < c <
	// b".
	// The return value is undefined if `IsMax()`.
	Next() Datum
	// IsMax returns true if the datum is equal to the maximum value the datum
	// type can hold.
	IsMax() bool
	// IsMin returns true if the datum is equal to the minimum value the datum
	// type can hold.
	IsMin() bool
}

A Datum holds either a bool, int64, float64, string or []Datum. 

var (
	// DummyBool is a placeholder DBool value.
	DummyBool Datum = DBool(false)
	// DummyInt is a placeholder DInt value.
	DummyInt Datum = DInt(0)
	// DummyFloat is a placeholder DFloat value.
	DummyFloat Datum = DFloat(0)
	// DummyDecimal is a placeholder DDecimal value.
	DummyDecimal Datum = DDecimal{}
	// DummyString is a placeholder DString value.
	DummyString Datum = DString("")
	// DummyBytes is a placeholder DBytes value.
	DummyBytes Datum = DBytes("")
	// DummyDate is a placeholder DDate value.
	DummyDate Datum = DDate(0)
	// DummyTimestamp is a placeholder DTimestamp value.
	DummyTimestamp Datum = DTimestamp{}
	// DummyInterval is a placeholder DInterval value.
	DummyInterval Datum = DInterval{}

	// DNull is the NULL Datum.
	DNull Datum = dNull{}
)

type DecimalType 

type DecimalType struct {
	Name  string
	Prec  int
	Scale int
}

DecimalType represents a DECIMAL or NUMERIC type.

func (*DecimalType) String 

func (node *DecimalType) String() string

type DefaultVal 

type DefaultVal struct{}

DefaultVal represents the DEFAULT expression.

func (DefaultVal) Eval 

func (t DefaultVal) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (DefaultVal) String 

func (node DefaultVal) String() string

func (DefaultVal) TypeCheck 

func (expr DefaultVal) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (DefaultVal) Walk 

func (DefaultVal) Walk(_ Visitor)

Walk implements the Expr interface.

type Delete 

type Delete struct {
	Table TableExpr
	Where *Where
}

Delete represents a DELETE statement.

func (*Delete) StatementType 

func (*Delete) StatementType() StatementType

StatementType implements the Statement interface.

func (*Delete) String 

func (node *Delete) String() string

type Direction 

type Direction int

Direction for ordering results. 

const (
	DefaultDirection Direction = iota
	Ascending
	Descending
)

Direction values.

func (Direction) String 

func (d Direction) String() string

type DropDatabase 

type DropDatabase struct {
	Name     Name
	IfExists bool
}

DropDatabase represents a DROP DATABASE statement.

func (*DropDatabase) StatementType 

func (*DropDatabase) StatementType() StatementType

StatementType implements the Statement interface.

func (*DropDatabase) String 

func (node *DropDatabase) String() string

type DropIndex 

type DropIndex struct {
	Names    QualifiedNames
	IfExists bool
}

DropIndex represents a DROP INDEX statement.

func (*DropIndex) StatementType 

func (*DropIndex) StatementType() StatementType

StatementType implements the Statement interface.

func (*DropIndex) String 

func (node *DropIndex) String() string

type DropTable 

type DropTable struct {
	Names    QualifiedNames
	IfExists bool
}

DropTable represents a DROP TABLE statement.

func (*DropTable) StatementType 

func (*DropTable) StatementType() StatementType

StatementType implements the Statement interface.

func (*DropTable) String 

func (node *DropTable) String() string

type EvalContext 

type EvalContext struct {
	NodeID        roachpb.NodeID
	StmtTimestamp DTimestamp
	TxnTimestamp  DTimestamp
	ReCache       *RegexpCache
	GetLocation   func() (*time.Location, error)
	Args          MapArgs
}

EvalContext defines the context in which to evaluate an expression, allowing the retrieval of state such as the node ID or statement start time.

func (EvalContext) NormalizeExpr 

func (ctx EvalContext) NormalizeExpr(expr Expr) (Expr, error)

NormalizeExpr normalizes an expression, simplifying where possible, but guaranteeing that the result of evaluating the expression is unchanged. Example normalizations: 

(a)                   -> a
ROW(a, b, c)          -> (a, b, c)
a = 1 + 1             -> a = 2
a + 1 = 2             -> a = 1
a BETWEEN b AND c     -> (a >= b) AND (a <= c)
a NOT BETWEEN b AND c -> (a < b) OR (a > c)

func (EvalContext) ParseTimestamp 

func (ctx EvalContext) ParseTimestamp(s DString) (DTimestamp, error)

ParseTimestamp parses the timestamp.

type ExistsExpr 

type ExistsExpr struct {
	Subquery Expr
}

ExistsExpr represents an EXISTS expression.

func (*ExistsExpr) Eval 

func (t *ExistsExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*ExistsExpr) String 

func (node *ExistsExpr) String() string

func (*ExistsExpr) TypeCheck 

func (expr *ExistsExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*ExistsExpr) Walk 

func (expr *ExistsExpr) Walk(v Visitor)

Walk implements the Expr interface.

type Explain 

type Explain struct {
	Options   []string
	Statement Statement
}

Explain represents an EXPLAIN statement.

func (*Explain) StatementType 

func (*Explain) StatementType() StatementType

StatementType implements the Statement interface.

func (*Explain) String 

func (node *Explain) String() string

type Expr 

type Expr interface {
	fmt.Stringer
	// Walk replaces each child of the receiver with the return of
	// `WalkExpr(v, child)`. For childless (leaf) Exprs, its
	// implementation is empty.
	Walk(Visitor)
	// TypeCheck returns the zero value of the expression's type, or an
	// error if the expression doesn't type-check. args maps bind var argument
	// names to types.
	TypeCheck(args MapArgs) (Datum, error)
	// Eval evaluates an SQL expression. Expression evaluation is a mostly
	// straightforward walk over the parse tree. The only significant complexity is
	// the handling of types and implicit conversions. See binOps and cmpOps for
	// more details. Note that expression evaluation returns an error if certain
	// node types are encountered: ValArg, QualifiedName or Subquery. These nodes
	// should be replaced prior to expression evaluation by an appropriate
	// WalkExpr. For example, ValArg should be replace by the argument passed from
	// the client.
	Eval(EvalContext) (Datum, error)
}

Expr represents an expression.

func ParseExprTraditional 

func ParseExprTraditional(sql string) (Expr, error)

ParseExprTraditional is a short-hand for parseExpr(sql, Traditional)

func WalkExpr 

func WalkExpr(v Visitor, expr Expr) Expr

WalkExpr traverses the nodes in an expression.

type Exprs 

type Exprs []Expr

Exprs represents a list of value expressions. It's not a valid expression because it's not parenthesized.

func (Exprs) String 

func (node Exprs) String() string

type FloatType 

type FloatType struct {
	Name string
	Prec int
}

FloatType represents a REAL, DOUBLE or FLOAT type.

func (*FloatType) String 

func (node *FloatType) String() string

type FuncExpr 

type FuncExpr struct {
	Name  *QualifiedName
	Type  funcType
	Exprs Exprs
	// contains filtered or unexported fields
}

FuncExpr represents a function call.

func (*FuncExpr) Eval 

func (expr *FuncExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*FuncExpr) String 

func (node *FuncExpr) String() string

func (*FuncExpr) TypeCheck 

func (expr *FuncExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*FuncExpr) Walk 

func (expr *FuncExpr) Walk(v Visitor)

Walk implements the Expr interface.

type Grant 

type Grant struct {
	Privileges privilege.List
	Targets    TargetList
	Grantees   NameList
}

Grant represents a GRANT statement.

func (*Grant) StatementType 

func (*Grant) StatementType() StatementType

StatementType implements the Statement interface.

func (*Grant) String 

func (node *Grant) String() string

type GroupBy 

type GroupBy []Expr

GroupBy represents a GROUP BY clause.

func (GroupBy) String 

func (node GroupBy) String() string

type IfExpr 

type IfExpr struct {
	Cond Expr
	True Expr
	Else Expr
}

IfExpr represents an IF expression.

func (*IfExpr) Eval 

func (expr *IfExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*IfExpr) String 

func (node *IfExpr) String() string

func (*IfExpr) TypeCheck 

func (expr *IfExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*IfExpr) Walk 

func (expr *IfExpr) Walk(v Visitor)

Walk implements the Expr interface.

type IndexElem 

type IndexElem struct {
	Column    Name
	Direction Direction
}

IndexElem represents a column with a direction in a CREATE INDEX statement.

func (IndexElem) String 

func (node IndexElem) String() string

type IndexElemList 

type IndexElemList []IndexElem

IndexElemList is list of IndexElem.

func NameListToIndexElems 

func NameListToIndexElems(lst NameList) IndexElemList

NameListToIndexElems converts a NameList to an IndexElemList with all members using the `DefaultDirection`.

func (IndexElemList) String 

func (l IndexElemList) String() string

String formats the contained names as a comma-separated, escaped string.

type IndexIndirection 

type IndexIndirection Name

IndexIndirection represents ":<name>" in an indirection expression.

func (IndexIndirection) String 

func (n IndexIndirection) String() string

type IndexTableDef 

type IndexTableDef struct {
	Name    Name
	Columns IndexElemList
	Storing NameList
}

IndexTableDef represents an index definition within a CREATE TABLE statement.

func (*IndexTableDef) String 

func (node *IndexTableDef) String() string

type Indirection 

type Indirection []IndirectionElem

Indirection represents an indirection expression composed of a series of indirection elements.

func (Indirection) String 

func (i Indirection) String() string

type IndirectionElem 

type IndirectionElem interface {
	String() string
	// contains filtered or unexported methods
}

IndirectionElem is a single element in an indirection expression.

type Insert 

type Insert struct {
	Table   *QualifiedName
	Columns QualifiedNames
	Rows    SelectStatement
}

Insert represents an INSERT statement.

func (*Insert) DefaultValues 

func (node *Insert) DefaultValues() bool

DefaultValues returns true iff only default values are being inserted.

func (*Insert) StatementType 

func (*Insert) StatementType() StatementType

StatementType implements the Statement interface.

func (*Insert) String 

func (node *Insert) String() string

type IntType 

type IntType struct {
	Name string
	N    int
}

IntType represents an INT, INTEGER, SMALLINT or BIGINT type.

func (*IntType) String 

func (node *IntType) String() string

type IntVal 

type IntVal struct {
	Val int64
	Str string
}

IntVal represents an integer.

func (*IntVal) Eval 

func (t *IntVal) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*IntVal) String 

func (node *IntVal) String() string

func (IntVal) TypeCheck 

func (expr IntVal) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (IntVal) Walk 

func (IntVal) Walk(_ Visitor)

Walk implements the Expr interface.

type IntervalType 

type IntervalType struct {
}

IntervalType represents an INTERVAL type

func (*IntervalType) String 

func (node *IntervalType) String() string

type IsOfTypeExpr 

type IsOfTypeExpr struct {
	Not   bool
	Expr  Expr
	Types []ColumnType
}

IsOfTypeExpr represents an IS {,NOT} OF (type_list) expression.

func (*IsOfTypeExpr) Eval 

func (expr *IsOfTypeExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*IsOfTypeExpr) String 

func (node *IsOfTypeExpr) String() string

func (*IsOfTypeExpr) TypeCheck 

func (expr *IsOfTypeExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*IsOfTypeExpr) Walk 

func (*IsOfTypeExpr) Walk(_ Visitor)

Walk implements the Expr interface.

type IsOp 

type IsOp int

IsOp represents an IS expression operator.

type IsolationLevel 

type IsolationLevel int

IsolationLevel holds the isolation level for a transaction. 

const (
	UnspecifiedIsolation IsolationLevel = iota
	SnapshotIsolation
	SerializableIsolation
)

IsolationLevel values

func (IsolationLevel) String 

func (i IsolationLevel) String() string

type JoinCond 

type JoinCond interface {
	// contains filtered or unexported methods
}

JoinCond represents a join condition.

type JoinTableExpr 

type JoinTableExpr struct {
	Join  string
	Left  TableExpr
	Right TableExpr
	Cond  JoinCond
}

JoinTableExpr represents a TableExpr that's a JOIN operation.

func (*JoinTableExpr) String 

func (node *JoinTableExpr) String() string

type Limit 

type Limit struct {
	Offset, Count Expr
}

Limit represents a LIMIT clause.

func (*Limit) String 

func (node *Limit) String() string

type MapArgs 

type MapArgs map[string]Datum

MapArgs is an Args implementation which is used for the type inference necessary to support the postgres wire protocol. See various TypeCheck() implementations for details.

func (MapArgs) Arg 

func (m MapArgs) Arg(name string) (Datum, bool)

Arg implements the Args interface.

func (MapArgs) SetInferredType 

func (m MapArgs) SetInferredType(d, typ Datum) (set Datum, err error)

SetInferredType sets the bind var argument d to the type typ in m. If m is nil or d is not a DValArg, nil is returned. If the bind var argument is set, typ is returned. An error is returned if typ cannot be set because a different type is already present.

type Name 

type Name string

A Name is an SQL identifier.

func (Name) String 

func (n Name) String() string

String formats an SQL identifier, applying proper escaping rules.

type NameIndirection 

type NameIndirection Name

NameIndirection represents ".<name>" in an indirection expression.

func (NameIndirection) String 

func (n NameIndirection) String() string

type NameList 

type NameList []string

A NameList is a list of identifier. TODO(tschottdorf): would be nicer to have []Name here but unless we want to introduce new types to the grammar, NameList([]string{...}) needs to work.

func (NameList) String 

func (l NameList) String() string

String formats the contained names as a comma-separated, escaped string.

type NotExpr 

type NotExpr struct {
	Expr Expr
}

NotExpr represents a NOT expression.

func (*NotExpr) Eval 

func (expr *NotExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*NotExpr) String 

func (node *NotExpr) String() string

func (*NotExpr) TypeCheck 

func (expr *NotExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*NotExpr) Walk 

func (expr *NotExpr) Walk(v Visitor)

Walk implements the Expr interface.

type NotNullConstraint 

type NotNullConstraint struct{}

NotNullConstraint represents NOT NULL on a column.

type NullConstraint 

type NullConstraint struct{}

NullConstraint represents NULL on a column.

type NullIfExpr 

type NullIfExpr struct {
	Expr1 Expr
	Expr2 Expr
}

NullIfExpr represents a NULLIF expression.

func (*NullIfExpr) Eval 

func (expr *NullIfExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*NullIfExpr) String 

func (node *NullIfExpr) String() string

func (*NullIfExpr) TypeCheck 

func (expr *NullIfExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*NullIfExpr) Walk 

func (expr *NullIfExpr) Walk(v Visitor)

Walk implements the Expr interface.

type Nullability 

type Nullability int

Nullability represents either NULL, NOT NULL or an unspecified value (silent NULL). 

const (
	NotNull Nullability = iota
	Null
	SilentNull
)

The values for NullType.

type NumVal 

type NumVal string

NumVal represents a number.

func (NumVal) Eval 

func (t NumVal) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (NumVal) String 

func (node NumVal) String() string

func (NumVal) TypeCheck 

func (expr NumVal) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (NumVal) Walk 

func (NumVal) Walk(_ Visitor)

Walk implements the Expr interface.

type OnJoinCond 

type OnJoinCond struct {
	Expr Expr
}

OnJoinCond represents an ON join condition.

func (*OnJoinCond) String 

func (node *OnJoinCond) String() string

type OrExpr 

type OrExpr struct {
	Left, Right Expr
}

OrExpr represents an OR expression.

func (*OrExpr) Eval 

func (expr *OrExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*OrExpr) String 

func (node *OrExpr) String() string

func (*OrExpr) TypeCheck 

func (expr *OrExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*OrExpr) Walk 

func (expr *OrExpr) Walk(v Visitor)

Walk implements the Expr interface.

type Order 

type Order struct {
	Expr      Expr
	Direction Direction
}

Order represents an ordering expression.

func (*Order) String 

func (node *Order) String() string

type OrderBy 

type OrderBy []*Order

OrderBy represents an ORDER By clause.

func (OrderBy) String 

func (node OrderBy) String() string

type OverlayExpr 

type OverlayExpr struct {
	FuncExpr
}

OverlayExpr represents an overlay function call.

func (*OverlayExpr) String 

func (node *OverlayExpr) String() string

type ParenExpr 

type ParenExpr struct {
	Expr
}

ParenExpr represents a parenthesized expression.

func (*ParenExpr) String 

func (node *ParenExpr) String() string

func (*ParenExpr) Walk 

func (expr *ParenExpr) Walk(v Visitor)

Walk implements the Expr interface.

type ParenSelect 

type ParenSelect struct {
	Select SelectStatement
}

ParenSelect represents a parenthesized SELECT/UNION/VALUES statement.

func (*ParenSelect) StatementType 

func (*ParenSelect) StatementType() StatementType

StatementType implements the Statement interface.

func (*ParenSelect) String 

func (node *ParenSelect) String() string

type ParenTableExpr 

type ParenTableExpr struct {
	Expr TableExpr
}

ParenTableExpr represents a parenthesized TableExpr.

func (*ParenTableExpr) String 

func (node *ParenTableExpr) String() string

type Parser 

type Parser struct {
	// contains filtered or unexported fields
}

Parser wraps a scanner, parser and other utilities present in the parser package.

func (*Parser) FillArgs 

func (p *Parser) FillArgs(stmt Statement, args Args) error

FillArgs replaces any placeholder nodes in the expression with arguments supplied with the query.

func (*Parser) NormalizeExpr 

func (p *Parser) NormalizeExpr(ctx EvalContext, expr Expr) (Expr, error)

NormalizeExpr is wrapper around ctx.NormalizeExpr which avoids allocation of a normalizeVisitor.

func (*Parser) Parse 

func (p *Parser) Parse(sql string, syntax Syntax) (StatementList, error)

Parse parses the sql and returns a list of statements.

func (*Parser) TypeCheckAndNormalizeExpr 

func (p *Parser) TypeCheckAndNormalizeExpr(ctx EvalContext, expr Expr) (Expr, error)

TypeCheckAndNormalizeExpr is a combination of TypeCheck() and NormalizeExpr(). It returns an error if either of TypeCheck() or NormalizeExpr() return one, and otherwise returns the Expr returned by NormalizeExpr().

type PrimaryKeyConstraint 

type PrimaryKeyConstraint struct{}

PrimaryKeyConstraint represents NULL on a column.

type QualifiedName 

type QualifiedName struct {
	Base     Name
	Indirect Indirection
	// contains filtered or unexported fields
}

QualifiedName is a base name and an optional indirection expression.

func StarExpr 

func StarExpr() *QualifiedName

StarExpr is a convenience function that represents an unqualified "*".

func (*QualifiedName) Column 

func (n *QualifiedName) Column() string

Column returns the column portion of the name. Note that the returned string is not quoted even if the name is a keyword.

func (*QualifiedName) Database 

func (n *QualifiedName) Database() string

Database returns the database portion of the name. Note that the returned string is not quoted even if the name is a keyword.

func (*QualifiedName) Eval 

func (t *QualifiedName) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*QualifiedName) Index 

func (n *QualifiedName) Index() string

Index returns the index portion of the name. Note that the returned string is not quoted even if the name is a keyword.

func (*QualifiedName) IsStar 

func (n *QualifiedName) IsStar() bool

IsStar returns true iff the qualified name contains matches "".* or table.*.

func (*QualifiedName) NormalizeColumnName 

func (n *QualifiedName) NormalizeColumnName() error

NormalizeColumnName normalizes the qualified name to contain a table name as prefix, returning an error if unable to do so or if the name is not a valid column name (e.g. it contains too many indirections). If normalization occurred, the modified qualified name will have n.Base == "" to indicate no explicit table was specified. The incoming qualified name should have one of the following forms: 

*
table.*
column
column[array-indirection]
table.column
table.column[array-indirection]

Note that "table" may be the empty string. On successful normalization the qualified name will have one of the forms: 

table.*
table.column
table.column[array-indirection]

func (*QualifiedName) NormalizeTableName 

func (n *QualifiedName) NormalizeTableName(database string) error

NormalizeTableName normalizes the qualified name to contain a database name as prefix, returning an error if unable to do so or if the name is not a valid table name (e.g. it contains an array indirection). The incoming qualified name should have one of the following forms: 

table
database.table
table@index
database.table@index

On successful normalization, the qualified name will have the form: 

database.table@index

func (*QualifiedName) String 

func (n *QualifiedName) String() string

func (*QualifiedName) Table 

func (n *QualifiedName) Table() string

Table returns the table portion of the name. Note that the returned string is not quoted even if the name is a keyword.

func (*QualifiedName) TypeCheck 

func (expr *QualifiedName) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*QualifiedName) Variable 

func (*QualifiedName) Variable()

Variable implements the VariableExpr interface.

func (*QualifiedName) Walk 

func (*QualifiedName) Walk(_ Visitor)

Walk implements the Expr interface.

type QualifiedNames 

type QualifiedNames []*QualifiedName

QualifiedNames represents a command separated list (see the String method) of qualified names.

func (QualifiedNames) String 

func (n QualifiedNames) String() string

type RangeCond 

type RangeCond struct {
	Not      bool
	Left     Expr
	From, To Expr
}

RangeCond represents a BETWEEN or a NOT BETWEEN expression.

func (*RangeCond) Eval 

func (t *RangeCond) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*RangeCond) String 

func (node *RangeCond) String() string

func (*RangeCond) TypeCheck 

func (expr *RangeCond) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*RangeCond) Walk 

func (expr *RangeCond) Walk(v Visitor)

Walk implements the Expr interface.

type RegexpCache 

type RegexpCache struct {
	// contains filtered or unexported fields
}

A RegexpCache is a cache used to store compiled regular expressions. The cache is safe for concurrent use by multiple goroutines. It is also safe to use the cache through a nil reference, where it will act like a valid cache with no capacity.

func NewRegexpCache 

func NewRegexpCache(size int) *RegexpCache

NewRegexpCache creates a new RegexpCache of the given size. The underlying cache internally uses a hash map, so lookups are cheap.

func (*RegexpCache) Clear 

func (rc *RegexpCache) Clear()

Clear clears all regular expressions from the cache.

func (*RegexpCache) GetRegexp 

func (rc *RegexpCache) GetRegexp(key regexpCacheKey) (*regexp.Regexp, error)

GetRegexp consults the cache for the regular expressions stored for the given key, compiling the key's pattern if it is not already in the cache.

func (*RegexpCache) Len 

func (rc *RegexpCache) Len() int

Len returns the number of compiled regular expressions in the cache.

type RenameColumn 

type RenameColumn struct {
	Table   *QualifiedName
	Name    Name
	NewName Name
	// IfExists refers to the table, not the column.
	IfExists bool
}

RenameColumn represents a RENAME COLUMN statement.

func (*RenameColumn) StatementType 

func (*RenameColumn) StatementType() StatementType

StatementType implements the Statement interface.

func (*RenameColumn) String 

func (node *RenameColumn) String() string

type RenameDatabase 

type RenameDatabase struct {
	Name    Name
	NewName Name
}

RenameDatabase represents a RENAME DATABASE statement.

func (*RenameDatabase) StatementType 

func (*RenameDatabase) StatementType() StatementType

StatementType implements the Statement interface.

func (*RenameDatabase) String 

func (node *RenameDatabase) String() string

type RenameIndex 

type RenameIndex struct {
	Name     *QualifiedName
	NewName  Name
	IfExists bool
}

RenameIndex represents a RENAME INDEX statement.

func (*RenameIndex) StatementType 

func (*RenameIndex) StatementType() StatementType

StatementType implements the Statement interface.

func (*RenameIndex) String 

func (node *RenameIndex) String() string

type RenameTable 

type RenameTable struct {
	Name     *QualifiedName
	NewName  *QualifiedName
	IfExists bool
}

RenameTable represents a RENAME TABLE statement.

func (*RenameTable) StatementType 

func (*RenameTable) StatementType() StatementType

StatementType implements the Statement interface.

func (*RenameTable) String 

func (node *RenameTable) String() string

type Revoke 

type Revoke struct {
	Privileges privilege.List
	Targets    TargetList
	Grantees   NameList
}

Revoke represents a REVOKE statements. PrivilegeList and TargetList are defined in grant.go

func (*Revoke) StatementType 

func (*Revoke) StatementType() StatementType

StatementType implements the Statement interface.

func (*Revoke) String 

func (node *Revoke) String() string

type RollbackTransaction 

type RollbackTransaction struct{}

RollbackTransaction represents a ROLLBACK statement.

func (*RollbackTransaction) StatementType 

func (*RollbackTransaction) StatementType() StatementType

StatementType implements the Statement interface.

func (*RollbackTransaction) String 

func (node *RollbackTransaction) String() string

type Row 

type Row Exprs

Row represents a parenthesized list of expressions. Similar to Tuple except in how it is textually represented.

func (Row) Eval 

func (t Row) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (Row) String 

func (node Row) String() string

func (Row) TypeCheck 

func (expr Row) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (Row) Walk 

func (expr Row) Walk(v Visitor)

Walk implements the Expr interface.

type Select 

type Select struct {
	Distinct bool
	Exprs    SelectExprs
	From     TableExprs
	Where    *Where
	GroupBy  GroupBy
	Having   *Where
	OrderBy  OrderBy
	Limit    *Limit
	Lock     string
	// contains filtered or unexported fields
}

Select represents a SELECT statement.

func (*Select) StatementType 

func (*Select) StatementType() StatementType

StatementType implements the Statement interface.

func (*Select) String 

func (node *Select) String() string

type SelectExpr 

type SelectExpr struct {
	Expr Expr
	As   Name
}

SelectExpr represents a SELECT expression.

func (SelectExpr) String 

func (node SelectExpr) String() string

type SelectExprs 

type SelectExprs []SelectExpr

SelectExprs represents SELECT expressions.

func (SelectExprs) String 

func (node SelectExprs) String() string

type SelectStatement 

type SelectStatement interface {
	Statement
	// contains filtered or unexported methods
}

SelectStatement any SELECT statement.

type Set 

type Set struct {
	Name   *QualifiedName
	Values Exprs
}

Set represents a SET statement.

func (*Set) StatementType 

func (*Set) StatementType() StatementType

StatementType implements the Statement interface.

func (*Set) String 

func (node *Set) String() string

type SetTimeZone 

type SetTimeZone struct {
	Value Expr
}

SetTimeZone represents a SET TIME ZONE statement.

func (*SetTimeZone) StatementType 

func (*SetTimeZone) StatementType() StatementType

StatementType implements the Statement interface.

func (*SetTimeZone) String 

func (node *SetTimeZone) String() string

type SetTransaction 

type SetTransaction struct {
	Isolation    IsolationLevel
	UserPriority UserPriority
}

SetTransaction represents a SET TRANSACTION statement.

func (*SetTransaction) StatementType 

func (*SetTransaction) StatementType() StatementType

StatementType implements the Statement interface.

func (*SetTransaction) String 

func (node *SetTransaction) String() string

type Show 

type Show struct {
	Name string
}

Show represents a SHOW statement.

func (*Show) StatementType 

func (*Show) StatementType() StatementType

StatementType implements the Statement interface.

func (*Show) String 

func (node *Show) String() string

type ShowColumns 

type ShowColumns struct {
	Table *QualifiedName
}

ShowColumns represents a SHOW COLUMNS statement.

func (*ShowColumns) StatementType 

func (*ShowColumns) StatementType() StatementType

StatementType implements the Statement interface.

func (*ShowColumns) String 

func (node *ShowColumns) String() string

type ShowDatabases 

type ShowDatabases struct {
}

ShowDatabases represents a SHOW DATABASES statement.

func (*ShowDatabases) StatementType 

func (*ShowDatabases) StatementType() StatementType

StatementType implements the Statement interface.

func (*ShowDatabases) String 

func (node *ShowDatabases) String() string

type ShowGrants 

type ShowGrants struct {
	Targets  *TargetList
	Grantees NameList
}

ShowGrants represents a SHOW GRANTS statement. TargetList is defined in grant.go.

func (*ShowGrants) StatementType 

func (*ShowGrants) StatementType() StatementType

StatementType implements the Statement interface.

func (*ShowGrants) String 

func (node *ShowGrants) String() string

type ShowIndex 

type ShowIndex struct {
	Table *QualifiedName
}

ShowIndex represents a SHOW INDEX statement.

func (*ShowIndex) StatementType 

func (*ShowIndex) StatementType() StatementType

StatementType implements the Statement interface.

func (*ShowIndex) String 

func (node *ShowIndex) String() string

type ShowTables 

type ShowTables struct {
	Name *QualifiedName
}

ShowTables represents a SHOW TABLES statement.

func (*ShowTables) StatementType 

func (*ShowTables) StatementType() StatementType

StatementType implements the Statement interface.

func (*ShowTables) String 

func (node *ShowTables) String() string

type SimpleTableExpr 

type SimpleTableExpr interface {
	// contains filtered or unexported methods
}

SimpleTableExpr represents a simple table expression.

type StarIndirection 

type StarIndirection string

StarIndirection represents ".*" in an indirection expression.

func (StarIndirection) String 

func (s StarIndirection) String() string

type Statement 

type Statement interface {
	fmt.Stringer
	StatementType() StatementType
}

Statement represents a statement.

func ParseOneTraditional 

func ParseOneTraditional(sql string) (Statement, error)

ParseOneTraditional is short-hand for parseOne(sql, Traditional)

type StatementList 

type StatementList []Statement

StatementList is a list of statements.

func (StatementList) String 

func (l StatementList) String() string

type StatementType 

type StatementType int

StatementType is the enumerated type for Statement return styles on the wire. 

const (
	// Ack indicates that the statement does not have a meaningful
	// return. Examples include SET, BEGIN, COMMIT.
	Ack StatementType = iota
	// DDL indicates that the statement mutates the database schema.
	DDL
	// RowsAffected indicates that the statement returns the count of
	// affected rows.
	RowsAffected
	// Rows indicates that the statement returns the affected rows after
	// the statement was applied.
	Rows
)

type StringType 

type StringType struct {
	Name string
	N    int
}

StringType represents a STRING, CHAR or VARCHAR type.

func (*StringType) String 

func (node *StringType) String() string

type Subquery 

type Subquery struct {
	Select SelectStatement
}

Subquery represents a subquery.

func (*Subquery) Eval 

func (t *Subquery) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*Subquery) String 

func (node *Subquery) String() string

func (*Subquery) TypeCheck 

func (expr *Subquery) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*Subquery) Walk 

func (expr *Subquery) Walk(v Visitor)

Walk implements the Expr interface.

type Syntax 

type Syntax int

Syntax is an enum of the various syntax types. 

const (
	// Implicit default, must stay in the zero-value position.
	Traditional Syntax = iota
	Modern
)

func (Syntax) String 

func (i Syntax) String() string

type TableDef 

type TableDef interface {
	// contains filtered or unexported methods
}

TableDef represents a column or index definition within a CREATE TABLE statement.

type TableDefs 

type TableDefs []TableDef

TableDefs represents a list of table definitions.

func (TableDefs) String 

func (node TableDefs) String() string

type TableExpr 

type TableExpr interface {
	// contains filtered or unexported methods
}

TableExpr represents a table expression.

type TableExprs 

type TableExprs []TableExpr

TableExprs represents a list of table expressions.

func (TableExprs) String 

func (node TableExprs) String() string

type TargetList 

type TargetList struct {
	Databases NameList
	Tables    QualifiedNames
}

TargetList represents a list of targets. Only one field may be non-nil.

func (TargetList) String 

func (tl TargetList) String() string

type TargetType 

type TargetType int

TargetType represents the type of target. 

const (
	TargetDatabase TargetType = iota
)

Enums for target and privilege types.

func (TargetType) String 

func (tt TargetType) String() string

type TimestampType 

type TimestampType struct {
}

TimestampType represents a TIMESTAMP type.

func (*TimestampType) String 

func (node *TimestampType) String() string

type Truncate 

type Truncate struct {
	Tables QualifiedNames
}

Truncate represents a TRUNCATE statement.

func (*Truncate) StatementType 

func (*Truncate) StatementType() StatementType

StatementType implements the Statement interface.

func (*Truncate) String 

func (node *Truncate) String() string

type Tuple 

type Tuple Exprs

Tuple represents a parenthesized list of expressions.

func (Tuple) Eval 

func (t Tuple) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (Tuple) String 

func (node Tuple) String() string

func (Tuple) TypeCheck 

func (expr Tuple) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (Tuple) Walk 

func (expr Tuple) Walk(v Visitor)

Walk implements the Expr interface.

type UnaryExpr 

type UnaryExpr struct {
	Operator UnaryOp
	Expr     Expr
	// contains filtered or unexported fields
}

UnaryExpr represents a unary value expression.

func (*UnaryExpr) Eval 

func (expr *UnaryExpr) Eval(ctx EvalContext) (Datum, error)

Eval implements the Expr interface.

func (*UnaryExpr) String 

func (node *UnaryExpr) String() string

func (*UnaryExpr) TypeCheck 

func (expr *UnaryExpr) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (*UnaryExpr) Walk 

func (expr *UnaryExpr) Walk(v Visitor)

Walk implements the Expr interface.

type UnaryOp 

type UnaryOp int

UnaryOp represents a unary operator. 

const (
	UnaryPlus UnaryOp = iota
	UnaryMinus
	UnaryComplement
)

UnaryExpr.Operator

func (UnaryOp) String 

func (i UnaryOp) String() string

type Union 

type Union struct {
	Type        string
	Left, Right SelectStatement
	All         bool
}

Union represents a UNION statement.

func (*Union) StatementType 

func (*Union) StatementType() StatementType

StatementType implements the Statement interface.

func (*Union) String 

func (node *Union) String() string

type UniqueConstraint 

type UniqueConstraint struct{}

UniqueConstraint represents UNIQUE on a column.

type UniqueConstraintTableDef 

type UniqueConstraintTableDef struct {
	IndexTableDef
	PrimaryKey bool
}

UniqueConstraintTableDef represents a unique constraint within a CREATE TABLE statement.

func (*UniqueConstraintTableDef) String 

func (node *UniqueConstraintTableDef) String() string

type Update 

type Update struct {
	Table TableExpr
	Exprs UpdateExprs
	Where *Where
}

Update represents an UPDATE statement.

func (*Update) StatementType 

func (*Update) StatementType() StatementType

StatementType implements the Statement interface.

func (*Update) String 

func (node *Update) String() string

type UpdateExpr 

type UpdateExpr struct {
	Tuple bool
	Names QualifiedNames
	Expr  Expr
}

UpdateExpr represents an update expression.

func (*UpdateExpr) String 

func (node *UpdateExpr) String() string

type UpdateExprs 

type UpdateExprs []*UpdateExpr

UpdateExprs represents a list of update expressions.

func (UpdateExprs) String 

func (node UpdateExprs) String() string

type UserPriority 

type UserPriority int

UserPriority holds the user priority for a transaction. 

const (
	UnspecifiedUserPriority UserPriority = iota
	Low
	Normal
	High
)

UserPriority values

func (UserPriority) String 

func (up UserPriority) String() string

type UsingJoinCond 

type UsingJoinCond struct {
	Cols NameList
}

UsingJoinCond represents a USING join condition.

func (*UsingJoinCond) String 

func (node *UsingJoinCond) String() string

type ValArg 

type ValArg struct {
	// contains filtered or unexported fields
}

ValArg represents a named bind var argument.

func (ValArg) Eval 

func (t ValArg) Eval(_ EvalContext) (Datum, error)

Eval implements the Expr interface.

func (ValArg) String 

func (node ValArg) String() string

func (ValArg) TypeCheck 

func (expr ValArg) TypeCheck(args MapArgs) (Datum, error)

TypeCheck implements the Expr interface.

func (ValArg) Variable 

func (ValArg) Variable()

Variable implements the VariableExpr interface.

func (ValArg) Walk 

func (ValArg) Walk(_ Visitor)

Walk implements the Expr interface.

type Values 

type Values []Tuple

Values represents a VALUES clause.

func (Values) StatementType 

func (Values) StatementType() StatementType

StatementType implements the Statement interface.

func (Values) String 

func (node Values) String() string

type VariableExpr 

type VariableExpr interface {
	Expr
	Variable()
}

VariableExpr is an Expr that may change per row. It is used to signal the evaluation/simplification machinery that the underlying Expr is not constant.

type Visitor 

type Visitor interface {
	Visit(expr Expr, pre bool) (Visitor, Expr)
}

The Visitor Visit method is invoked for each Expr node encountered by WalkExpr. The returned Expr replaces the pointer to the visited expression in the parent node and can be used for rewriting expressions. The pre argument indicates whether the visit is a pre-order or post-order visit. On a pre-order visit, if the result Visitor is nil children nodes are skipped from the traversal.

type When 

type When struct {
	Cond Expr
	Val  Expr
}

When represents a WHEN sub-expression.

func (*When) String 

func (node *When) String() string

type Where 

type Where struct {
	Type string
	Expr Expr
}

Where represents a WHERE or HAVING clause.

func (*Where) String 

func (node *Where) String() string

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