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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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16
sql/sql_type.h
View File

@ -2525,6 +2525,14 @@ public:
};
class Type_handler_varchar_compressed: public Type_handler_varchar
{
public:
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_blob_common: public Type_handler_longstr
{
public:
@ -2625,6 +2633,14 @@ public:
};
class Type_handler_blob_compressed: public Type_handler_blob
{
public:
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
#ifdef HAVE_SPATIAL
class Type_handler_geometry: public Type_handler_string_result
{