Dear Devs, I'm trying to fix a compilation issue with the subquery in SQLPP and got a question about the specification of "Expression". Here is the current grammar of "Query" and "Expression" in SQLPP:
Query::=( Expression | SelectExpression ) Expression::=( OperatorExpr | CaseExpr | QuantifiedExpression ) I'm wondering why "SelectExpression" is not in the specification of "Expression" but in "Query". When I looked back to the AQL specification, I found that we have: Query::=Expression Expression::=( OperatorExpr | IfThenElse | FLWOGR | QuantifiedExpression ) If this specification in SQLPP is not intentionally designed, can we change it to this: Query::=( Expression ) Expression::=( OperatorExpr | CaseExpr | QuantifiedExpression | SelectExpression ) ? As the Subquery are handled separately in the parenthesized expression part, the "SelectExpression" here is non-subquery by default. Any thoughts? Thanks! Best, Xikui
