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https://issues.apache.org/jira/browse/ARROW-886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16110778#comment-16110778
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Emilio Lahr-Vivaz commented on ARROW-886:
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That would probably be fine. My use case is:
1. Create a parent vector (NullableMapVector) with several children of
different types (some fixed width, some variable width)
2. Write an unknown number of elements to the vectors, using the child vector
mutators
For the variable-width vectors, I'm using `mutator.setSafe`, as there is no
other way to guarantee sufficient size (to my knowledge). But for the fixed
with vectors, I'd like to check size once on the parent, then expand them all
as needed, instead of having to use `.setSafe` for every write. Having a way to
externally grow a vector (outside of setSafe) seems like it would be useful any
time you don't know the number of elements you're writing up front.
> VariableLengthVectors don't reAlloc offsets
> -------------------------------------------
>
> Key: ARROW-886
> URL: https://issues.apache.org/jira/browse/ARROW-886
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java - Vectors
> Affects Versions: 0.3.0
> Reporter: Emilio Lahr-Vivaz
> Assignee: Emilio Lahr-Vivaz
> Fix For: 0.3.0
>
>
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