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391ea219c2
BY A CONCURRENT TRANSACTIO The member function QUICK_RANGE_SELECT::init_ror_merged_scan() performs a table handler clone. Innodb does not provide a clone operation. The ha_innobase::clone() is not there. The handler::clone() does not take care of the ha_innobase->prebuilt->select_lock_type. Because of this what happens is that for one index we do a locking read, and for the other index we were doing a non-locking (consistent) read. The patch introduces ha_innobase::clone() member function. It is implemented similar to ha_myisam::clone(). It calls the base class handler::clone() and then does any additional operation required. I am setting the ha_innobase->prebuilt->select_lock_type correctly. rb://1060 approved by Marko
57 lines
1.2 KiB
Plaintext
57 lines
1.2 KiB
Plaintext
create table t1 (
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rowid int,
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f1 int,
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f2 int,
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key i1 (f1, f2),
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key i2 (f2)) engine=innodb;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`rowid` int(11) DEFAULT NULL,
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`f1` int(11) DEFAULT NULL,
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`f2` int(11) DEFAULT NULL,
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KEY `i1` (`f1`,`f2`),
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KEY `i2` (`f2`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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insert into `t1` (rowid, f1, f2) values (1, 1, 10), (2, 1, NULL);
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start transaction with consistent snapshot;
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start transaction;
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update t1 set f2 = 4 where f1 = 1 and f2 is null;
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(b) Number of rows updated:
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select row_count();
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row_count()
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1
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insert into t1 values (3, 1, null);
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(b) After update and insert query.
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select rowid, f1, f2 from t1;
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rowid f1 f2
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1 1 10
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2 1 4
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3 1 NULL
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commit;
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(a) Before the update statement is executed.
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select rowid, f1, f2 from t1;
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rowid f1 f2
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1 1 10
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2 1 NULL
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SET SESSION debug="+d,bug14007649";
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update t1 set f2 = 6 where f1 = 1 and f2 is null;
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(a) Number of rows updated:
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select row_count();
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row_count()
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1
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(a) After the update statement is executed.
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select rowid, f1, f2 from t1;
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rowid f1 f2
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1 1 10
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2 1 NULL
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3 1 6
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commit;
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"The trx with consistent snapshot ended."
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select rowid, f1, f2 from t1;
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rowid f1 f2
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1 1 10
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2 1 4
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3 1 6
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drop table t1;
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