[jira] [Created] (FLINK-21738) reduce unnecessary method calls in ModuleManager

[Shang Yuanchun (Jira)]

zoucao created FLINK-21738:
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             Summary: reduce unnecessary method calls  in ModuleManager
                 Key: FLINK-21738
                 URL: https://issues.apache.org/jira/browse/FLINK-21738
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
            Reporter: zoucao


In flink sql, if we use many functions(hive func or flink built-in func), Flink will call method

`getFunctionDefinition` in [ModuleManager|https://github.com/apache/flink/blob/97bfd049951f8d52a2e0aed14265074c4255ead0/flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/module/ModuleManager.java#L44] many times to load func and each module's method `listFunctions` will be called at the same time. I think the same result will be returned for one module, so maybe a cache should be used here to reduce time waste.



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