snuyanzin commented on code in PR #21958:
URL: https://github.com/apache/flink/pull/21958#discussion_r1109698642
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docs/data/sql_functions.yml:
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@@ -617,6 +617,9 @@ collection:
- sql: ARRAY_DISTINCT(haystack)
table: haystack.arrayDistinct()
description: Returns an array with unique elements. If the array itself is
null, the function will return null. Keeps ordering of elements.
+ - sql: ARRAY_UNION(array1, array2)
+ table: haystack.arrayUnion(array)
+ description: Returns an array of the elements in the union of array1 and
array2, without duplicates. If both of the array are null, the function will
return null.
Review Comment:
From the description it is not clear what happens if only one array is `null`
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