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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