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https://issues.apache.org/jira/browse/ARROW-5212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662235#comment-17662235
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Rok Mihevc commented on ARROW-5212:
-----------------------------------
This issue has been migrated to [issue
#21687|https://github.com/apache/arrow/issues/21687] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Go] Array BinaryBuilder in Go library has no access to resize the values
> buffer
> --------------------------------------------------------------------------------
>
> Key: ARROW-5212
> URL: https://issues.apache.org/jira/browse/ARROW-5212
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Go
> Reporter: Jonathan A Sternberg
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.14.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> When you are dealing with a binary builder, there are three buffers: the null
> bitmap, the offset indexes, and the values buffer which contains the actual
> data.
> When {{Reserve}} or {{Resize}} are used, the null bitmap and the offsets are
> modified to allow for additional appends to function. This seems correct to
> me. There's no way to know how much the values buffer should be resized until
> the values are being appended with just the number of values alone.
> But, when you are then appending a bunch of string values, there's no
> additional API to preallocate the size of that last buffer. That means that
> batch appending a large amount of strings will constantly allocate even if
> you know the size ahead of time.
> There should be some additional API to modify this last buffer such as maybe
> {{ReserveBytes}} and {{ResizeBytes}} that would correspond with the
> {{Reserve}} and {{Resize}} methods, but would related to the values buffer.
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