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MDEV-11371 - column compression

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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.
This commit is contained in:
Sergey Vojtovich
2017-04-24 17:54:18 +04:00
parent dd4e9cdded
commit fdc4779235
32 changed files with 2648 additions and 151 deletions
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5
include/mysql_com.h
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@@ -485,7 +485,10 @@ enum enum_field_types { MYSQL_TYPE_DECIMAL, MYSQL_TYPE_TINY,
MYSQL_TYPE_TIMESTAMP2,
MYSQL_TYPE_DATETIME2,
MYSQL_TYPE_TIME2,
/* Compressed types are only used internally for RBR. */
MYSQL_TYPE_BLOB_COMPRESSED= 140,
MYSQL_TYPE_VARCHAR_COMPRESSED= 141,
MYSQL_TYPE_NEWDECIMAL=246,
MYSQL_TYPE_ENUM=247,
MYSQL_TYPE_SET=248,