hanyuzheng7 commented on PR #22842:
URL: https://github.com/apache/flink/pull/22842#issuecomment-1619462048

   > This query fails with NullPointerException
   > 
   > ```sql
   > SELECT map_union(MAP[1, 2], MAP[CAST(NULL AS INT), 3]);
   > ```
   
   key = CAST(NULL AS INT) is ok now.
   
   


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