index

Documentation

Index

• func CanOptimize(l *logrus.Entry, ctx *session.Context, node ast.Node) bool
• func WithCalculateCardinalityMaxRow(row int) optimizerOption
• func WithCompositeIndexMaxColumn(column int) optimizerOption
• func WithCreateIndexStatement(f func(tableName string, columns ...string) string) optimizerOption
• type OptimizeResult
• type Optimizer
  • func NewOptimizer(log *logrus.Entry, ctx *session.Context, opts ...optimizerOption) *Optimizer
  • func (o *Optimizer) Optimize(ctx context.Context, selectStmt *ast.SelectStmt) ([]*OptimizeResult, error)

Functions

func CanOptimize

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

CanOptimize do some pre check on node.

func WithCalculateCardinalityMaxRow

func WithCalculateCardinalityMaxRow(row int) optimizerOption

func WithCompositeIndexMaxColumn

func WithCompositeIndexMaxColumn(column int) optimizerOption

func WithCreateIndexStatement

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

Types

type OptimizeResult

type OptimizeResult struct {
	TableName      string
	IndexedColumns []string

	Reason string
}

type Optimizer

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

func NewOptimizer

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

func (*Optimizer) Optimize

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

Optimize give index advice for the select statement.