[jira] [Created] (ARROW-3831) [C++] arrow::util::Codec::Decompress() doesn't return decompressed data size

["Kouhei Sutou (JIRA)" <ji...@apache.org>]

Kouhei Sutou created ARROW-3831:
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             Summary: [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


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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