hanyuzheng7 commented on PR #22717:
URL: https://github.com/apache/flink/pull/22717#issuecomment-1587333488

   @snuyanzin  for this case `SELECT array_concat(ARRAY[1], ARRAY[CAST(NULL AS 
INT)]); -- returns [1, 0]`
   other method has same problem such as array_union, I cannot solve it up to 
now.


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