cloud-fan commented on code in PR #52428:
URL: https://github.com/apache/spark/pull/52428#discussion_r2443657127


##########
sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -927,6 +929,10 @@ lateralView
     : LATERAL VIEW (OUTER)? qualifiedName LEFT_PAREN (expression (COMMA 
expression)*)? RIGHT_PAREN tblName=identifier (AS? colName+=identifier (COMMA 
colName+=identifier)*)?
     ;
 
+watermarkClause
+    : WATERMARK colName=namedExpression DELAY OF delay=interval

Review Comment:
   if we really want to enforce the name



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