snuyanzin commented on PR #22717: URL: https://github.com/apache/flink/pull/22717#issuecomment-1586911570
I did a bit testing here are findings 1. nullable + non-nullable vs non-nullable + nullable ```sql SELECT array_concat(ARRAY[CAST(NULL AS INT)], ARRAY[1]); -- returns [NULL, 1], this is OK SELECT array_concat(ARRAY[1], ARRAY[CAST(NULL AS INT)]); -- returns [1, 0], this is NOT OK ``` 2. different types ```sql SELECT array_concat(ARRAY['2'], ARRAY['1']); -- returns [2, 1], this is NOT OK SELECT array_concat(ARRAY['2'], ARRAY[1]); -- returns [2, ], this is NOT OK ``` 3. wrong(incompatible) types ```sql SELECT array_concat(ARRAY[ARRAY[1]], ARRAY[1]); -- fails with ArrayIndexOutOfBoundsException ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
