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https://issues.apache.org/jira/browse/ARROW-5929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16884803#comment-16884803
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Liya Fan commented on ARROW-5929:
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[~wesmckinn], many thanks for opening this issue.
I think this is a useful feature covering many important use cases.
> [Java] Define API for ExtensionVector whose data must be serialized prior to
> being sent via IPC
> -----------------------------------------------------------------------------------------------
>
> Key: ARROW-5929
> URL: https://issues.apache.org/jira/browse/ARROW-5929
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Wes McKinney
> Assignee: Liya Fan
> Priority: Major
>
> As being discussed on the mailing list, a possible use case for
> ExtensionVector involves having the Arrow buffers contain pointer-type values
> referring to memory outside of the Arrow memory heap. In IPC, such vectors
> would need to be serialized to a wholly Arrow-resident form, such as a
> VarBinaryVector. We do not have an API to allow for this, so this JIRA
> proposes to add new functions that can indicate to the IPC layer that an
> ExtensionVector requires additional serialization to a native Arrow type (in
> such case, the extension type metadata would be discarded)
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