planbuilder

const (
	// PlanPassSelect is pass through select statements. This is the
	// default plan for select statements.
	PlanPassSelect PlanType = iota
	// PlanSelectLock is for a select that locks.
	PlanSelectLock
	// PlanNextval is for NEXTVAL.
	PlanNextval
	// PlanPassDML is pass through update & delete statements. This is
	// the default plan for update and delete statements.
	// If PassthroughDMLs is true, then it is used for all DML statements
	// and is valid in all replication modes.
	// Otherwise is only allowed in row based replication mode
	PlanPassDML
	// PlanDMLPK is an update or delete with an equality where clause(s)
	// on primary key(s).
	PlanDMLPK
	// PlanDMLSubquery is an update or delete with a subselect statement
	PlanDMLSubquery
	// PlanInsertPK is insert statement where the PK value is
	// supplied with the query.
	PlanInsertPK
	// PlanInsertSubquery is same as PlanDMLSubquery but for inserts.
	PlanInsertSubquery
	// PlanUpsertPK is for insert ... on duplicate key constructs.
	PlanUpsertPK
	// PlanInsertMessage is for inserting into message tables.
	PlanInsertMessage
	// PlanSet is for SET statements.
	PlanSet
	// PlanDDL is for DDL statements.
	PlanDDL
	// PlanSelectStream is used for streaming queries.
	PlanSelectStream
	// PlanOtherRead is for SHOW, DESCRIBE & EXPLAIN statements.
	PlanOtherRead
	// PlanOtherAdmin is for REPAIR, OPTIMIZE and TRUNCATE statements.
	PlanOtherAdmin
	// PlanMessageStream is used for streaming messages.
	PlanMessageStream
	// PlanSelectImpossible is used for where or having clauses that can never be true.
	PlanSelectImpossible
	// NumPlans stores the total number of plans
	NumPlans
)

const (
	ReasonDefault ReasonType = iota
	ReasonTable
	ReasonTableNoIndex
	ReasonPKChange
	ReasonComplexExpr
	ReasonUpsertSubquery
	ReasonUpsertMultiRow
	ReasonReplace
	ReasonMultiTable
	NumReasons
)