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9dc81f7d38
Changing columns WITH/WITHOUT SYSTEM VERSIONING doens't require to read data at all. Thus it should be an instant operation. Patch also fixes a bug when ALTER_COLUMN_UNVERSIONED wasn't passed to InnoDB to change its internal structures. change_field_versioning_try(): apply WITH/WITHOUT SYSTEM VERSIONING change in SYS_COLUMNS for one field. change_fields_versioning_try(): apply WITH/WITHOUT SYSTEM VERSIONING change in SYS_COLUMNS for every changed field in a table. change_fields_versioning_cache(): update cache for versioning property of columns.
87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
CREATE OR REPLACE TABLE t1 (
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a INT,
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b INT,
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row_start BIGINT UNSIGNED AS ROW START INVISIBLE,
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row_end BIGINT UNSIGNED AS ROW END INVISIBLE,
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PERIOD FOR SYSTEM_TIME(row_start, row_end)
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) WITH SYSTEM VERSIONING ENGINE=INNODB;
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CREATE OR REPLACE TABLE t2 (
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a INT WITHOUT SYSTEM VERSIONING,
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b INT,
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row_start BIGINT UNSIGNED AS ROW START INVISIBLE,
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row_end BIGINT UNSIGNED AS ROW END INVISIBLE,
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PERIOD FOR SYSTEM_TIME(row_start, row_end)
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) WITH SYSTEM VERSIONING ENGINE=INNODB;
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INSERT INTO t1 VALUES (1,1);
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INSERT INTO t2 VALUES (1,1);
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SET @@SYSTEM_VERSIONING_ALTER_HISTORY=KEEP;
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# without rebuild
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ALTER TABLE t1
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CHANGE a a INT WITHOUT SYSTEM VERSIONING,
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ALGORITHM=INSTANT;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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ALTER TABLE t2
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CHANGE a a INT WITH SYSTEM VERSIONING,
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ADD PRIMARY KEY pk (a),
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ALGORITHM=INSTANT;
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ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
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# with rebuild
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ALTER TABLE t2
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CHANGE a a INT WITH SYSTEM VERSIONING,
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ADD PRIMARY KEY pk (a);
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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UPDATE t1 SET a=2;
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SELECT COUNT(*) FROM t1 FOR SYSTEM_TIME ALL;
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COUNT(*)
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1
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UPDATE t2 SET a=2;
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SELECT COUNT(*) FROM t2 FOR SYSTEM_TIME ALL;
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COUNT(*)
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2
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DROP TABLE t1, t2;
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# rollback ALTER TABLE: nothing should change
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CREATE TABLE t (
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a INT,
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b INT,
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row_start BIGINT UNSIGNED AS ROW START INVISIBLE,
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row_end BIGINT UNSIGNED AS ROW END INVISIBLE,
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PERIOD FOR SYSTEM_TIME(row_start, row_end)
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) WITH SYSTEM VERSIONING ENGINE=INNODB;
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INSERT INTO t VALUES (1, 1);
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SELECT C.PRTYPE FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS AS C
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JOIN INFORMATION_SCHEMA.INNODB_SYS_TABLES AS t ON C.TABLE_ID=t.TABLE_ID
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WHERE t.NAME='test/t' AND C.NAME='b';
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PRTYPE
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50179
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SET @@SYSTEM_VERSIONING_ALTER_HISTORY=KEEP;
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SET @SAVED_DEBUG_DBUG = @@SESSION.DEBUG_DBUG;
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SET DEBUG_DBUG='+d,ib_commit_inplace_fail_1';
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ALTER TABLE t
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CHANGE b b INT WITHOUT SYSTEM VERSIONING;
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ERROR HY000: Internal error: Injected error!
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SET DEBUG_DBUG = @SAVED_DEBUG_DBUG;
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SELECT C.PRTYPE FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS AS C
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JOIN INFORMATION_SCHEMA.INNODB_SYS_TABLES AS t ON C.TABLE_ID=t.TABLE_ID
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WHERE t.NAME='test/t' AND C.NAME='b';
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PRTYPE
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50179
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SHOW CREATE TABLE t;
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Table Create Table
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t CREATE TABLE `t` (
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`a` int(11) DEFAULT NULL,
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`b` int(11) DEFAULT NULL,
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`row_start` bigint(20) unsigned GENERATED ALWAYS AS ROW START INVISIBLE,
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`row_end` bigint(20) unsigned GENERATED ALWAYS AS ROW END INVISIBLE,
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PERIOD FOR SYSTEM_TIME (`row_start`, `row_end`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 WITH SYSTEM VERSIONING
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SELECT COUNT(*) FROM t FOR SYSTEM_TIME ALL;
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COUNT(*)
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1
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UPDATE t SET b=11;
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SELECT COUNT(*) FROM t FOR SYSTEM_TIME ALL;
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COUNT(*)
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2
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DROP TABLE t;
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