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7a27db778e
Allow instant changes of columns in ROW_FORMAT=REDUNDANT from NOT NULL to NULL. Later, this may be implemented for ROW_FORMAT=COMPACT or DYNAMIC, but in that case any indexes on the table must be rebuilt. dict_table_t::prepare_instant(): Add some debug assertions, and relax a debug assertion so that the number of fields is allowed not to change. dict_index_t::instant_add_field(): Relax a debug assertion, allowing a column to change from NOT NULL to NULL. dict_table_t::instant_column(): Add debug assertions. instant_alter_column_possible(): Allow ALTER_COLUMN_NULLABLE when applicable. innodb_insert_sys_columns(): Add the parameter bool update=false to run UPDATE instead of INSERT. innobase_instant_add_col(): Remove; let the only caller invoke innodb_insert_sys_columns() directly. innobase_instant_try(): Update the SYS_COLUMNS record if the column is changed. Only convert the table to the instant ALTER TABLE format if necessary. For ALTER_COLUMN_NULLABLE in ROW_FORMAT=REDUNDANT, there is no data format change.
56 lines
2 KiB
Text
56 lines
2 KiB
Text
create table t (a int NOT NULL) engine=innodb row_format= compressed;
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alter table t modify a int NULL, algorithm=instant;
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ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
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drop table t;
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create table t (a int NOT NULL) engine=innodb row_format= dynamic;
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alter table t modify a int NULL, algorithm=instant;
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ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
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drop table t;
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create table t (a int NOT NULL) engine=innodb row_format= compact;
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alter table t modify a int NULL, algorithm=instant;
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ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
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drop table t;
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create table t (
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id int primary key,
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a int NOT NULL default 0,
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b int NOT NULL default 0,
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c int NOT NULL default 0,
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index idx (a,b,c)
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) engine=innodb row_format=redundant;
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insert into t (id, a) values (0, NULL);
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ERROR 23000: Column 'a' cannot be null
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insert into t (id, b) values (0, NULL);
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ERROR 23000: Column 'b' cannot be null
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insert into t (id, c) values (0, NULL);
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ERROR 23000: Column 'c' cannot be null
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insert into t values (1,1,1,1);
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set @id = (select table_id from information_schema.innodb_sys_tables
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where name = 'test/t');
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select * from information_schema.innodb_sys_columns where table_id=@id;
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TABLE_ID NAME POS MTYPE PRTYPE LEN
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TABLE_ID id 0 6 1283 4
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TABLE_ID a 1 6 1283 4
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TABLE_ID b 2 6 1283 4
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TABLE_ID c 3 6 1283 4
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alter table t modify a int NULL, algorithm=instant;
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insert into t values (2, NULL, 2, 2);
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alter table t modify b int NULL, algorithm=nocopy;
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insert into t values (3, NULL, NULL, 3);
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alter table t modify c int NULL, algorithm=inplace;
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insert into t values (4, NULL, NULL, NULL);
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select * from information_schema.innodb_sys_columns where table_id=@id;
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TABLE_ID NAME POS MTYPE PRTYPE LEN
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TABLE_ID id 0 6 1283 4
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TABLE_ID a 1 6 1027 4
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TABLE_ID b 2 6 1027 4
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TABLE_ID c 3 6 1027 4
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select * from t;
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id a b c
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4 NULL NULL NULL
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3 NULL NULL 3
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2 NULL 2 2
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1 1 1 1
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check table t;
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Table Op Msg_type Msg_text
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test.t check status OK
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drop table t;
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