snuyanzin commented on PR #22717: URL: https://github.com/apache/flink/pull/22717#issuecomment-1590918465
```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 ``` this should be fixed first >so this is a java innate cast problem that's not true the issue is with your element getter https://github.com/apache/flink/pull/22717/files#diff-5bd5fdffc578c878d7e04819795e9fe56751a0810d0d39fcf25dc507ac83ab03R43 ```java final DataType dataType = ((CollectionDataType) context.getCallContext().getArgumentDataTypes().get(0)) .getElementDataType(); ``` it creates getter based on first arg, and as it is shown earlier sometimes it behaves not as expected... probably for this case it's better to use output data type rather than input -- 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]
