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5 commits

Author SHA1 Message Date
Sergey Vojtovich
b40b3720cb MDEV-21348 - column compression memory leak 
The Storage-Engine Independent Column Compression does not call
deflateEnd() when deflate() does not return Z_STREAM_END.

This for instance happens when the data is already (externally)
compressed and deflate() needs more space than the original data.

This patch is based on contribution by Martijn Broenland.
 2020-04-02 00:57:00 +04:00
Sergey Vojtovich
791fb9ea24 Fixed compiler warning 2018-04-20 18:29:18 +04:00
Sergey Vojtovich
38c799c9a5 MDEV-15763 - VARCHAR(1) COMPRESSED crashes the server 
Storing 1 byte long string in VARCHAR() COMPRESSED column may trigger
integer overflow when calculating available space for zlib output.
 2018-04-20 17:05:28 +04:00
Vladislav Vaintroub
769f060398 Fix some warnings 2017-10-27 19:21:58 +00:00
Sergey Vojtovich
fdc4779235 MDEV-11371 - column compression 
Storage engine independent support for column compression.

TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT,
VARCHAR and VARBINARY columns can be compressed.

New COMPRESSED column attribute added:
COMPRESSED[=<compression_method>]

System variables added:
column_compression_threshold
column_compression_zlib_level
column_compression_zlib_strategy
column_compression_zlib_wrap

Status variables added:
Column_compressions
Column_decompressions

Limitations:
- the only supported method currently is zlib
- CSV storage engine stores data uncompressed on-disk even if COMPRESSED
  attribute is present
- it is not possible to create indexes over compressed columns.
 2017-08-31 15:44:17 +04:00