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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
59 lines
1.1 KiB
Plaintext
59 lines
1.1 KiB
Plaintext
--source include/have_innodb.inc
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--source include/have_debug.inc
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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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insert into `t1` (rowid, f1, f2) values (1, 1, 10), (2, 1, NULL);
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connect (a,localhost,root,,);
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connect (b,localhost,root,,);
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connection a;
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start transaction with consistent snapshot;
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connection b;
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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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-- echo (b) Number of rows updated:
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select row_count();
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insert into t1 values (3, 1, null);
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-- echo (b) After update and insert query.
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select rowid, f1, f2 from t1;
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commit;
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connection a;
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-- echo (a) Before the update statement is executed.
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select rowid, f1, f2 from t1;
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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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-- echo (a) Number of rows updated:
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select row_count();
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-- echo (a) After the update statement is executed.
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select rowid, f1, f2 from t1;
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commit;
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--echo "The trx with consistent snapshot ended."
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select rowid, f1, f2 from t1;
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connection default;
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disconnect a;
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disconnect b;
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drop table t1;
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