[jira] [Created] (ARROW-5929) [Java] Define API for ExtensionVector whose data must be serialized prior to being sent via IPC

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-5929:
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             Summary: [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


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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