liuyongvs opened a new pull request, #22483:
URL: https://github.com/apache/flink/pull/22483
- What is the purpose of the change
This is an implementation of ARRAY_UNION
- Brief change log
ARRAY_UNION for Table API and SQL
```
Returns an array of the elements in the union of array1 and array2, without
duplicates.
Syntax:
array_union(array1, array2)
Arguments:
array: An ARRAY to be handled.
Returns:
An ARRAY. If any of the array is null, the function will return null.
Examples:
> SELECT array_union(array(1, 2, 3), array(1, 3, 5));
[1,2,3,5]
```
See also
spark https://spark.apache.org/docs/latest/api/sql/index.html#array_union
presto https://prestodb.io/docs/current/functions/array.html
- Verifying this change
This change added tests in CollectionFunctionsITCase.
- 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):
(yes )
The serializers: (no)
The runtime per-record code paths (performance sensitive): ( no)
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? (yes)
If yes, how is the feature documented? (docs)
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