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https://issues.apache.org/jira/browse/FLINK-21738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17300097#comment-17300097
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Jane Chan commented on FLINK-21738:
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Hi [~zoucao], I guess using the `json_tuple` lateral table function may much
more suitable for parsing multiple key-value
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-json_tuple
> 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
> Priority: Major
>
> 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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