[FLINK-19739][table-runtime-blink] Fix compile exception for window aggregate in batch jobs #16618
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(This PR is cherry-picked from #16591.)
What is the purpose of the change
Currently generated code for window aggregate in batch jobs will not compile if the aggregation has no grouping keys or any named properties (such as tumble_start). This PR fixes this issue.
Brief change log
Verifying this change
This change added tests and can be verified by running the added tests.
Does this pull request potentially affect one of the following parts:
@Public(Evolving)
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