Method normalize

pkg/sql/sem/tree/normalize.go:168–217

(v *NormalizeVisitor)

}

func (expr *AndExpr) normalize(v *NormalizeVisitor) TypedExpr {
	left := expr.TypedLeft()
	right := expr.TypedRight()
	var dleft, dright Datum

	if left == DNull && right == DNull {
		return DNull
	}

	// Use short-circuit evaluation to simplify AND expressions.
	if v.isConst(left) {
		dleft, v.err = left.Eval(v.ctx)
		if v.err != nil {
			return expr
		}
		if dleft != DNull {
			if d, err := GetBool(dleft); err == nil {
				if !d {
					return dleft
				}
				return right
			}
			return DNull
		}
		return NewTypedAndExpr(
			dleft,
			right,
		)
	}
	if v.isConst(right) {
		dright, v.err = right.Eval(v.ctx)
		if v.err != nil {
			return expr
		}
		if dright != DNull {
			if d, err := GetBool(dright); err == nil {
				if !d {
					return right
				}
				return left
			}
			return DNull
		}
		return NewTypedAndExpr(
			left,
			dright,
		)
	}
	return expr
}

func (expr *ComparisonExpr) normalize(v *NormalizeVisitor) TypedExpr {
	switch expr.Operator {