stefankandic commented on code in PR #45405:
URL: https://github.com/apache/spark/pull/45405#discussion_r1516396458


##########
sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -1096,7 +1096,7 @@ colPosition
     ;
 
 collateClause
-    : COLLATE collationName=stringLit
+    : COLLATE collationName=identifier

Review Comment:
   what about this case:
   ```code
   select 'a' collate UNICODE-columnB
   ```
   
   shouldn't we report that the types are incompatible for minus operation?



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