snuyanzin commented on code in PR #24317:
URL: https://github.com/apache/flink/pull/24317#discussion_r1495660945


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flink-table/flink-sql-parser/src/main/codegen/templates/Parser.jj:
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@@ -0,0 +1,8469 @@
+/*

Review Comment:
   IIRC we could extend it if we want something completly new e.g. support of 
`ADD JAR` feature or new keyword, functions and etc. 
   However the problem here that we need override parser's behavior how it 
parses `FROM` clause to read tables which should be joined... And this looks 
unextendable ... At least I was not able to find a way to override it in a 
simpler way
   Would be great if there are other ideas



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