Function rewriteIsExpr

query/expr/parser.go:272–300

(expr Expr)

}

func rewriteIsExpr(expr Expr) (Expr, error) {
	e, ok := expr.(*BinaryExpr)
	if !ok {
		return expr, nil
	}

	if e.Op == IS {
		op, err := rewriteIsOp(e.RHS)
		if err != nil {
			return nil, err
		}
		expr, err := rewriteIsExpr(e.LHS)
		if err != nil {
			return nil, err
		}
		return &UnaryExpr{Op: op, Expr: expr}, nil
	}

	var err error
	e.LHS, err = rewriteIsExpr(e.LHS)
	if err != nil {
		return nil, err
	}
	e.RHS, err = rewriteIsExpr(e.RHS)
	if err != nil {
		return nil, err
	}
	return expr, nil
}

// ParseExpr parses an expression.
// binOpPrcdncLb: binary operator precedence lower bound.