cloud-fan commented on code in PR #48649:
URL: https://github.com/apache/spark/pull/48649#discussion_r1831409388
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sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -1502,8 +1502,11 @@ version
;
operatorPipeRightSide
- : selectClause
- | whereClause
+ : selectClause windowClause?
+ // Note that the WINDOW clause is not allowed in the WHERE pipe operator,
but we add it here in
+ // the grammar simply for purposes of catching this invalid syntax and
throwing a specific
+ // dedicated error message.
+ | whereClause windowClause?
Review Comment:
Why we only allow optional window clause after SELECT and WHERE?
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