dylanhz opened a new pull request, #25216:
URL: https://github.com/apache/flink/pull/25216
## What is the purpose of the change
Add the built-in function TO_NUMBER.
Examples:
```SQL
-- The format expects:
-- * an optional sign at the beginning,
-- * followed by a dollar sign,
-- * followed by a number between 3 and 6 digits long,
-- * thousands separators,
-- * up to two dight beyond the decimal point.
> SELECT TO_NUMBER('-$12,345.67', 'S$999,099.99');
-12345.67
-- Plus is optional, and so are fractional digits.
> SELECT TO_NUMBER('$345', 'S$999,099.99');
345.00
-- The format requires at least three digits.
> SELECT TO_NUMBER('$45', 'S$999,099.99');
NULL
-- The format requires at least three digits
> SELECT TO_NUMBER('$045', 'S$999,099.99');
45.00
-- Using brackets to denote negative values
> SELECT TO_NUMBER('<1234>', '999999PR');
-1234
```
## Brief change log
- [FLINK-36025](https://issues.apache.org/jira/browse/FLINK-36025)
- Add `ToNumberTypeStrategy`
- Add `NumberParser`
- Fix doc issue of function PRINTF
## Verifying this change
- `StringFunctionsITCase#toNumberTestCases`
- `TypeStrategiesTest#testData`
- `NumberParserTest`
## 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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