[jira] [Created] (FLINK-25409) Add cache metric to LookupFunction

[Yuan Zhu (Jira)]

Yuan Zhu created FLINK-25409:
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             Summary: Add cache metric to LookupFunction
                 Key: FLINK-25409
                 URL: https://issues.apache.org/jira/browse/FLINK-25409
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Ecosystem
            Reporter: Yuan Zhu


Since we encounter performance problem when lookup join in production env 
frequently, adding metrics to monitor Lookup function cache is very helpful to 
troubleshoot.



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