[
https://issues.apache.org/jira/browse/ARROW-8666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098898#comment-17098898
]
David Li commented on ARROW-8666:
---------------------------------
Hi [~fan_li_ya], loadFieldBuffers should do the trick, thanks for pointing it
out!
The motivation here is we are constructing a dense union vector where the child
arrays are in turn struct vectors. Semantically, this is intended as the union
of distinct top-level schemas so that we can pass through different datasets in
a single Flight RPC. Ideally we can do this with minimal/no copying or
allocation, so being able to just transfer the arrays from the input
VectorSchemaRoots and construct the right type ID and offset buffers is perfect.
> [Java] DenseUnionVector has no way to set offset/validity directly
> ------------------------------------------------------------------
>
> Key: ARROW-8666
> URL: https://issues.apache.org/jira/browse/ARROW-8666
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Affects Versions: 0.17.0
> Reporter: David Li
> Priority: Major
>
> You can set the type ID manually, but you cannot set the offset or validity
> directly. Ideally, we'd have an API like Python that lets us build it
> directly from constituent vectors and the offsets/type IDs.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
