hanyuzheng7 opened a new pull request, #23176:
URL: https://github.com/apache/flink/pull/23176
## What is the purpose of the change
This is an implementation of FIELD
The FIELD function returns the position of a value in a list of values
(val...).
The list support mixed data type.
## Brief change log
FIELD for Table API and SQL
Syntax:
`FIELD(value, val...)`
Arguments:
value: The value to find in the list.
val... : The list of values that is to be searched.
Returns:
If value is not found in the list of values (val...), the FIELD function
will return 0.
If value is NULL, the FIELD function will return 0.
If list of values is NULL or EMPTY, return 0.
Examples:
```
SELECT FIELD('b', 'a', 'b', 'c', 'd', 'e', 'f');
Result: 2
SELECT FIELD(ARRAY[1, 2, 3], 1, 'b', 'c', ARRAY[1, 2, 3], 'e', 'f');
Result: 4
SELECT FIELD(15, 10, 20, 15, 40);
Result: 3
SELECT FIELD('c', 2.1, 'b');
Result: 0
SELECT FIELD('g', '');
Result: 0
SELECT FIELD(null, 'a', 2, 'c');
Result: 0
SELECT FIELD('a', null);
Result: 0
```
See also:
MySQL:https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_field
## 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): (yes / no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / no)
- The serializers: (yes / no / don't know)
- 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: (yes / no / don't know)
- The S3 file system connector: (yes / no / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / no)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ not documented)
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