Jark Wu created FLINK-5225:
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Summary: Add interface to override parameter types of UDTF's eval
method
Key: FLINK-5225
URL: https://issues.apache.org/jira/browse/FLINK-5225
Project: Flink
Issue Type: Improvement
Reporter: Jark Wu
{{ScalarFunction}} has {{getParameterTypes()}} to be overridden if the
parameter types of the eval method can not be determined automatically. This is
missing in {{TableFunction}}.
This needs to implement a custom Calcite's {{TableFunction}} and override
{{getParameters()}}. But currently, the {{FlinkTableFunctionImpl}} extends
{{ReflectiveFunctionBase}}, the {{ReflectiveFunctionBase}} determines the
parameter types of the eval method.
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