matriv opened a new pull request #17811:
URL: https://github.com/apache/flink/pull/17811
## What is the purpose of the change
Certain Flink sinks, i.e. RDBMs will not accept rows where there are string
values which length exceeds the `precision` defined for the corresponding
column type, (e.g. `VARCHAR(20)`). Previously, there was no check in place, and
such records would simply cause errors, possibly bringing down the whole
pipeline.
## Brief change log
- Create a new `ConstraintValidator` operator that implements the existing
NOT NULL constraint for sinks
- Implement the new CHAR/VARCHAR length validator inside this new operator
## Verifying this change
Added
`org.apache.flink.table.planner.runtime.stream.table.TableSinkITCase#testCharPrecisionEnforcer`
## 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)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): **YES**
- 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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