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Antoine PitrouFrançois Saint-Jacques
eb73b962e42
Antoine Pitrou authored and François Saint-Jacques committed a39f7b27e2c
ARROW-5974: [C++] Support reading concatenated compressed streams

Multiple concatenated compressed streams are read back as a single decompressed stream.

Closes #4923 from pitrou/ARROW-5974-concatenated-compressed-streams and squashes the following commits:

582380301 <Antoine Pitrou> Refactor CompressedInputStream implementation to make control flow clearer
c5d42b070 <Antoine Pitrou> Use unique_ptr<T>::reset()
8913fda00 <Antoine Pitrou> Workaround for old lz4 versions
dea8b99da <Antoine Pitrou> Use dedicated reset functions where available
918502a35 <Antoine Pitrou> ARROW-5974:  Support reading concatenated compressed streams

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>