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Hi!
Expected see full definition for virtual column into extra field.
SHOW CREATE TABLE crm_kladr
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CREATE TABLE `crm_kladr` (
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`name` varchar(40) NOT NULL,
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`socr` varchar(10) NOT NULL,
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`code` varchar(13) NOT NULL,
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`index` varchar(6) NOT NULL,
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`gninmb` varchar(4) NOT NULL,
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`uno` varchar(4) NOT NULL,
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`ocatd` varchar(11) NOT NULL,
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`status` varchar(1) NOT NULL,
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`regioncode` varchar(3) DEFAULT NULL,
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`raioncode` varchar(3) DEFAULT NULL,
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`citycode` varchar(3) DEFAULT NULL,
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`towncode` varchar(3) DEFAULT NULL,
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`actual` varchar(2) AS ( (SUBSTR(`code`, -2))) PERSISTENT,
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PRIMARY KEY (`code`),
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KEY `IX_kladr_name` (`name`),
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KEY `IX_kladr_regioncode` (`regioncode`),
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KEY `IX_kladr_raioncode` (`raioncode`),
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KEY `IX_kladr_citycode` (`citycode`),
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KEY `IX_kladr_towncode` (`towncode`),
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KEY `IX_kladr_postindex` (`index`),
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KEY `actual` (`actual`) USING BTREE
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) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT
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SHOW COLUMNS FROM crm_kladr FROM dev;
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Field Type Null Key Default Extra
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---------- ----------- ------ ------ ------- ------------
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name varchar(40) NO MUL (NULL)
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socr varchar(10) NO (NULL)
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code varchar(13) NO PRI (NULL)
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index varchar(6) NO MUL (NULL)
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gninmb varchar(4) NO (NULL)
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uno varchar(4) NO (NULL)
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ocatd varchar(11) NO (NULL)
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status varchar(1) NO (NULL)
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regioncode varchar(3) YES MUL (NULL)
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raioncode varchar(3) YES MUL (NULL)
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citycode varchar(3) YES MUL (NULL)
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towncode varchar(3) YES MUL (NULL)
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actual varchar(2) YES MUL (NULL) PERSISTENT
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SELECT * FROM information_schema.columns WHERE table_schema = 'dev' AND table_name = 'crm_kladr'
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TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION COLUMN_DEFAULT IS_NULLABLE DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE DATETIME_PRECISION CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE COLUMN_KEY EXTRA PRIVILEGES COLUMN_COMMENT
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------------- ------------ ---------- ----------- ---------------- -------------- ----------- --------- ------------------------ ---------------------- ----------------- ------------- ------------------ ------------------ --------------- ----------- ---------- ---------- ------------------------------- ----------------
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def dev crm_kladr name 1 (NULL) NO varchar 40 120 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(40) MUL select,insert,update,references
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def dev crm_kladr socr 2 (NULL) NO varchar 10 30 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(10) select,insert,update,references
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def dev crm_kladr code 3 (NULL) NO varchar 13 39 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(13) PRI select,insert,update,references
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def dev crm_kladr index 4 (NULL) NO varchar 6 18 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(6) MUL select,insert,update,references
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def dev crm_kladr gninmb 5 (NULL) NO varchar 4 12 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(4) select,insert,update,references
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def dev crm_kladr uno 6 (NULL) NO varchar 4 12 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(4) select,insert,update,references
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def dev crm_kladr ocatd 7 (NULL) NO varchar 11 33 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(11) select,insert,update,references
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def dev crm_kladr status 8 (NULL) NO varchar 1 3 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(1) select,insert,update,references
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def dev crm_kladr regioncode 9 (NULL) YES varchar 3 9 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(3) MUL select,insert,update,references
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def dev crm_kladr raioncode 10 (NULL) YES varchar 3 9 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(3) MUL select,insert,update,references
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def dev crm_kladr citycode 11 (NULL) YES varchar 3 9 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(3) MUL select,insert,update,references
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def dev crm_kladr towncode 12 (NULL) YES varchar 3 9 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(3) MUL select,insert,update,references
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def dev crm_kladr actual 13 (NULL) YES varchar 2 6 (NULL) (NULL) (NULL) utf8 utf8_general_ci varchar(2) MUL PERSISTENT select,insert,update,references
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In examples above we see only keyword "PERSISTENT", but be better if we see "AS ( (SUBSTR(`code`, -2))) PERSISTENT"
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