Gopal V created HIVE-7859:
-----------------------------
Summary: Tune zlib compression in ORC to account for the encoding
strategy
Key: HIVE-7859
URL: https://issues.apache.org/jira/browse/HIVE-7859
Project: Hive
Issue Type: Bug
Components: File Formats
Reporter: Gopal V
Currently ORC Zlib is slow because several compression strategies ZLib uses is
already done by ORC in itself (dictionary, RLE, bit-packing).
We need to pick between Z_FILTERED, Z_HUFFMAN_ONLY, Z_RLE, Z_FIXED and
Z_DEFAULT_STRATEGY according to column stream type.
For instance an RLE_V2 stream could a use Z_FILTERED compression without
invoking the rest of the strategies.
The string streams can use Z_FIXED compression strategies and so on.
The core limitation to stick to retain compatibility with the default
decompressor, so that these are automatically backward compatible.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
