snuyanzin commented on code in PR #28170:
URL: https://github.com/apache/flink/pull/28170#discussion_r3408744137


##########
flink-table/flink-sql-parser/src/main/codegen/templates/Parser.jj:
##########
@@ -2844,6 +2877,27 @@ SqlNode WindowRange() :
     )
 }
 
+/** Parses an exclusion clause for WINDOW FRAME. */
+SqlLiteral WindowExclusion() :
+{
+}
+{
+    (

Review Comment:
   by default exclusion passed, however since in Flink there is no specific 
logic, behaves as without it.
   
   For now made explicitly failing if such syntax is used



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