snuyanzin commented on PR #22834:
URL: https://github.com/apache/flink/pull/22834#issuecomment-1621949525

   if the third is optional the result should be same as the third arg is equal 
to length of the array (same as in case of `substring`)
   the result should be 
   ```
   array_slice(ARRAY[1,2,3] , -3) -> [1,2,3]        <-- here yes, correct, it 
is same as  array_slice(ARRAY[1,2,3] , -3)
   array_slice(ARRAY[1,2,3] , 1) -> [1, 2, 3]       <-- here it is same as 
array_slice(ARRAY[1,2,3] , 1, 3)
   and array_slice(ARRAY[1,2,3], 4) -> []           <-- same as 
array_slice(ARRAY[1,2,3], 4, 3) -> []
   ```


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