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Problem description:
Table 't' created with two colums having compound index on both the
columns under innodb/myisam engine at remote machine. In the local
machine same table is created undet the federated engine.
A select having where clause with along 'AND' operation gives wrong
results on local machine.
Analysis:
The given query at federated engine is wrongly transformed by
federated::create_where_from_key() function and the same was sent to
the remote machine. Hence the local machine is showing wrong results.
Given query "select c1 from t where c1 <= 2 and c2 = 1;"
Query transformed, after ha_federated::create_where_from_key() function is:
SELECT `c1`, `c2` FROM `t` WHERE (`c1` IS NOT NULL ) AND
( (`c1` >= 2) AND (`c2` <= 1) ) and the same sent to real_query().
In the above the '<=' and '=' conditions were transformed to '>=' and
'<=' respectively.
ha_federated::create_where_from_key() function behaving as below:
The key_range is having both the start_key and end_key. The start_key
is used to get "(`c1` IS NOT NULL )" part of the where clause, this
transformation is correct. The end_key is used to get "( (`c1` >= 2)
AND (`c2` <= 1) )", which is wrong, here the given conditions('<=' and '=')
are changed as wrong conditions('>=' and '<=').
The end_key is having {key = 0x39fa6d0 "", length = 10, keypart_map = 3,
flag = HA_READ_AFTER_KEY}
The store_length is having value '5'. Based on store_length and length
values the condition values is applied in HA_READ_AFTER_KEY switch case.
The switch case 'HA_READ_AFTER_KEY' is applicable to only the last part of
the end_key and for previous parts it is going to 'HA_READ_KEY_OR_NEXT' case,
here the '>=' is getting added as a condition instead of '<='.
Fix:
Updated the 'if' condition in 'HA_READ_AFTER_KEY' case to affect for all
parts of the end_key. i.e 'i > 0' will used for end_key, Hence added it in
the if condition.
40 lines
1023 B
Plaintext
40 lines
1023 B
Plaintext
--source include/have_debug.inc
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--source suite/federated/include/federated.inc
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--echo #
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--echo # Bug#47525: MySQL crashed (Federated)
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--echo #
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connection slave;
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--echo # Switch to slave
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CREATE TABLE t1(a INT);
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INSERT INTO t1 VALUES (1);
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connection master;
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--echo # Switch to master
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--replace_result $SLAVE_MYPORT SLAVE_PORT
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eval CREATE TABLE t1(a INT) ENGINE=FEDERATED
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CONNECTION='mysql://root@127.0.0.1:$SLAVE_MYPORT/test/t1';
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SELECT * FROM t1;
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--echo # Start a asynchronous reload
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--exec $MYSQLADMIN --no-defaults -S $MASTER_MYSOCK -P $MASTER_MYPORT -u root --password= refresh 2>&1
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--echo # Wait for tables to be closed
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let $show_statement= SHOW STATUS LIKE 'Open_tables';
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let $field= Value;
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let $condition= = '0';
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--source include/wait_show_condition.inc
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--echo # Ensure that the server didn't crash
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SELECT * FROM t1;
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--echo # Drop tables on master and slave
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DROP TABLE t1;
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connection slave;
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DROP TABLE t1;
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connection default;
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--echo # Federated cleanup
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source suite/federated/include/federated_cleanup.inc;
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