bowenli86 commented on a change in pull request #9217: [FLINK-13277][hive] add 
documentation of Hive source/sink
URL: https://github.com/apache/flink/pull/9217#discussion_r314130270
 
 

 ##########
 File path: docs/dev/table/hive/index.md
 ##########
 @@ -263,3 +259,5 @@ The following limitations in Hive's data types impact the 
mapping between Flink
 * Flink's `TIMESTAMP_WITH_TIME_ZONE` is not supported by Hive
 * Flink's `TIMESTAMP_WITH_LOCAL_TIME_ZONE` is not supported by Hive
 * Flink's `MULTISET` is not supported by Hive
+* Hive's `UNION` type is not supported
 
 Review comment:
   I'll make these couple changes of data types in a different PR so this PR 
can focus on Hive source/sink. Thanks!

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