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https://issues.apache.org/jira/browse/ARROW-13733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-13733.
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Fix Version/s: 6.0.0
Resolution: Fixed
Issue resolved by pull request 10983
[https://github.com/apache/arrow/pull/10983]
> [Java] Allow JDBC adapters to reuse vector schema roots
> -------------------------------------------------------
>
> Key: ARROW-13733
> URL: https://issues.apache.org/jira/browse/ARROW-13733
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 6.0.0
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> According to the current design of the JDBC adapter, it is not possible to
> reuse the vector schema roots. That is, a new vector schema root is created
> and released for each batch.
> This can cause performance problems, because in many scenarios, the client
> code only reads data in vector schema root. So the vector schema roots can be
> reused in the following cycle: populate data -> client use data -> populate
> data -> ...
> The current design has another problem. For most times, it has two
> alternating vector schema roots in memory, causing a large waste of memory,
> especially for large batches.
> We solve both problems by providing a flag in the config, which allows the
> user to reuse the vector shema roots.
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