database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

MDEV-11371 - column compression

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

6
sql/sql_class.h
View File

@ -551,6 +551,7 @@ typedef struct system_variables
ha_rows max_join_size;
ha_rows expensive_subquery_limit;
ulong auto_increment_increment, auto_increment_offset;
ulong column_compression_zlib_strategy;
ulong lock_wait_timeout;
ulong join_cache_level;
ulong max_allowed_packet;
@ -638,6 +639,7 @@ typedef struct system_variables
my_bool sql_log_bin_off;
my_bool binlog_annotate_row_events;
my_bool binlog_direct_non_trans_update;
my_bool column_compression_zlib_wrap;
plugin_ref table_plugin;
plugin_ref tmp_table_plugin;
@ -692,6 +694,8 @@ typedef struct system_variables
uint idle_transaction_timeout;
uint idle_readonly_transaction_timeout;
uint idle_readwrite_transaction_timeout;
uint column_compression_threshold;
uint column_compression_zlib_level;
} SV;
/**
@ -702,6 +706,8 @@ typedef struct system_variables
typedef struct system_status_var
{
ulong column_compressions;
ulong column_decompressions;
ulong com_stat[(uint) SQLCOM_END];
ulong com_create_tmp_table;
ulong com_drop_tmp_table;