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v1.2210.0 Latest Latest Go to latest Published: Oct 25, 2022 License: MPL-2.0 Imports: 18 Imported by: 0

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func CanOptimize(l *logrus.Entry, ctx *session.Context, node ast.Node) bool

CanOptimize do some pre check on node.

func WithCalculateCardinalityMaxRow(row int) optimizerOption

func WithCompositeIndexMaxColumn(column int) optimizerOption

func WithCreateIndexStatement(f func(tableName string, columns ...string) string) optimizerOption

type OptimizeResult struct {
	TableName      string
	IndexedColumns []string

	Reason string
}

type Optimizer struct {
	*session.Context
	// contains filtered or unexported fields
}

func NewOptimizer(log *logrus.Entry, ctx *session.Context, opts ...optimizerOption) *Optimizer

func (o *Optimizer) Optimize(ctx context.Context, selectStmt *ast.SelectStmt) ([]*OptimizeResult, error)

Optimize give index advice for the select statement.