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https://issues.apache.org/jira/browse/CALCITE-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17527942#comment-17527942
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itxiangkui commented on CALCITE-5099:
-------------------------------------
I did an experiment:
1. Go to the sqlline terminal to query the data of mysql_catalog.database.table
2. Call calcite's api to connect to Calcite's Connection to execute Sql
The former does not call the close() method to close the connection after the
ResultSetEnumerable is iterated; the latter calls the close() method correctly
to close the connection
Indeed, as described in the https://calcite.apache.org/avatica/docs/index.htmlÂ
documentation, there is no action to close the connection
> ResultSetEnumerable.enumeratorBasedOnStatement cause the backend connection
> leak
> ---------------------------------------------------------------------------------
>
> Key: CALCITE-5099
> URL: https://issues.apache.org/jira/browse/CALCITE-5099
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.30.0
> Reporter: itxiangkui
> Priority: Major
> Labels: connection, connection-pooling, leak
>
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