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https://issues.apache.org/jira/browse/ARROW-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690849#comment-16690849
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Antoine Pitrou commented on ARROW-3831:
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The current use case is that you already know the decompressed size, because
the information was recorded somewhere (in e.g. a Parquet file).
> [C++] arrow::util::Codec::Decompress() doesn't return decompressed data size
> ----------------------------------------------------------------------------
>
> Key: ARROW-3831
> URL: https://issues.apache.org/jira/browse/ARROW-3831
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 0.11.1
> Reporter: Kouhei Sutou
> Priority: Major
>
> We can't know decompressed data size when we only have compressed data. The
> current {{arrow::util::Codec::Decompress()}} doesn't return decompressed data
> size. So we can't know which data in {{output_buffer}} can be used.
> FYI: {{arrow::util::Codec::Compress()}} returns compressed data size.
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