[FLINK-32721][table-planner] Fix SQL MAX aggregation function does no… #23671
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…t support CHAR type
What is the purpose of the change
Support max aggregation with char data type by reusing the existing MaxAggFunction.
Brief change log
Files updated:
Verifying this change
This change is covered in existing unit test and manual test. Please see also FLINK-32721
Does this pull request potentially affect one of the following parts:
@Public(Evolving)
: noDocumentation