xuyangzhong opened a new pull request #18375:
URL: https://github.com/apache/flink/pull/18375
## What is the purpose of the change
Now function MAX and MIN does not support the type CHAR and will throw the
exception like following:
`Caused by: org.apache.flink.table.api.TableException: Max aggregate
function does not support type: ''CHAR''.
Please re-check the data type.
at
org.apache.flink.table.planner.plan.utils.AggFunctionFactory.createMaxAggFunction(AggFunctionFactory.scala:395)
at
org.apache.flink.table.planner.plan.utils.AggFunctionFactory.createAggFunction(AggFunctionFactory.scala:76)
at
org.apache.flink.table.planner.plan.utils.AggregateUtil$.$anonfun$transformToAggregateInfoList$1(AggregateUtil.scala:444)`
This pr aims to add the support in MAX and MIN with both retract and
non-retract stream data.
## Brief change log
- *support CHAR in MAX (Retract&nonRetract).*
- *support CHAR in MIN (Retract)*
- *add some test cases*
## Verifying this change
Some test cases are added to verify this change.
## 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): 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? no
- If yes, how is the feature documented?
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