liuyongvs opened a new pull request, #22277:
URL: https://github.com/apache/flink/pull/22277
- What is the purpose of the change
This is an implementation of ARRAY_REVERSE
- Brief change log
ARRAY_REVERSE for Table API and SQL
```
array_reverse(array) - Returns an array in reverse order.
Syntax:
array_reverse(array)
Arguments:
array: An ARRAY to be handled.
Returns:
Returns an array in reverse order.
If the array itself is null, the function will return null.
> SELECT array_reverse(array(1, 2, 2, NULL));
NULL, 2, 2, 1
```
See also
spark
[https://spark.apache.org/docs/latest/api/sql/index.html#array_remove](https://spark.apache.org/docs/latest/api/sql/index.html#array_position)
postgresql
https://www.postgresql.org/docs/12/functions-array.html#ARRAY-FUNCTIONS-TABLE
- 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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