liuyongvs opened a new pull request, #22324:
URL: https://github.com/apache/flink/pull/22324
- What is the purpose of the change
This is an implementation of MAP_FROM_ENTRIES
- Brief change log
MAP_FROM_ENTRIES for Table API and SQL
```
map_from_entries(map) - Returns a map created from an arrays of row with two
fields. Note that the number of fields in a row array should be 2 and the key
of a row array should not be null.
Syntax:
map_from_entries(array_of_rows)
Arguments:
array_of_rows: an arrays of row with two fields.
Returns:
Returns a map created from an arrays of row with two fields. Note that the
number of fields in a row array should be 2 and the key of a row array should
not be null.
Returns null if the argument is null
> SELECT map_from_entries(map[1, 'a', 2, 'b']);
[(1,"a"),(2,"b")]
```
See also
presto https://prestodb.io/docs/current/functions/map.html
spark
https://spark.apache.org/docs/latest/api/sql/index.html#map_from_entries
- Verifying this change
This change added tests in MapFunctionITCase.
- 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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