Method NormalizeExpr

pkg/sql/sem/tree/normalize.go:677–684

NormalizeExpr normalizes a typed expression, simplifying where possible, but guaranteeing that the result of evaluating the expression is unchanged and that resulting expression tree is still well-typed. Example normalizations: (a) -> a a = 1 + 1 -> a = 2 a + 1 = 2

(typedExpr TypedExpr)

//   a BETWEEN b AND c     -> (a >= b) AND (a <= c)
//   a NOT BETWEEN b AND c -> (a < b) OR (a > c)
func (ctx *EvalContext) NormalizeExpr(typedExpr TypedExpr) (TypedExpr, error) {
	v := MakeNormalizeVisitor(ctx)
	expr, _ := WalkExpr(&v, typedExpr)
	if v.err != nil {
		return nil, v.err
	}
	return expr.(TypedExpr), nil
}

// NormalizeVisitor supports the execution of NormalizeExpr.
type NormalizeVisitor struct {