snuyanzin opened a new pull request, #22779:
URL: https://github.com/apache/flink/pull/22779
## What is the purpose of the change
The problem case for `array_union` is
```sql
SELECT array_union(ARRAY[CAST(NULL AS INT)], ARRAY[1]); -- returns [NULL,
1], this is OK
SELECT array_union(ARRAY[1], ARRAY[CAST(NULL AS INT)]); -- returns [1, 0],
this is NOT OK
```
the PR is going to fix it.
The reason of the issue is that element getter relies on the first arg of
`array_union` without taking into account the second one.
## Verifying this change
A test was added at `CollectionFunctionsITCase.java`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): ( no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: ( no)
- The serializers: ( no)
- The runtime per-record code paths (performance sensitive): (yes / no /
don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: ( no )
- The S3 file system connector: ( no )
## Documentation
- Does this pull request introduce a new feature? ( no)
- If yes, how is the feature documented? (not applicable)
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