Github user sounakr commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/723#discussion_r109635229
--- Diff:
integration/spark/src/main/scala/org/apache/spark/sql/hive/CarbonPreInsertionCasts.scala
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@@ -0,0 +1,62 @@
+/*
--- End diff --
Done, currently to keep 1.5 and 2.1 in sync, CarbonAnalysisRules.scala will
keep the rules of IUD and Insert Select. Created CarbonAnalysisRules.scala in
2.1 where currenly on Insert-Select is there as IUD is still not ported to 2.1
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