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https://issues.apache.org/jira/browse/FLINK-21415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288213#comment-17288213
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Jark Wu commented on FLINK-21415:
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If you want to have more accurate result, you can disable cache or reduce the
TTL.
> JDBC does not query data, and the cache will store an ArrayList without data
> ----------------------------------------------------------------------------
>
> Key: FLINK-21415
> URL: https://issues.apache.org/jira/browse/FLINK-21415
> Project: Flink
> Issue Type: Bug
> Components: Connectors / JDBC, Table SQL / Ecosystem
> Affects Versions: 1.12.1
> Reporter: Shuai Xia
> Priority: Major
> Labels: pull-request-available
>
> JDBC does not query data, and the cache will store an ArrayList without data.
> We should add size judgment.
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