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ee3d4ec414
Support index condition pushdown within partitioned tables.
- ha_partition will pass the pushed index condition into all of the used
partitions.
- We require that all of the partitions to handle the pushed index
condition in the same way.
- When using ICP, one may read rows (e.g. call h->index_read_map(buf, ...)
only to buf= table->record[0], for two reasons:
* Pushed index condition's Item_field objects point into record[0]
* InnoDB requires this: it calls offset() which assumes record[0].
So, when using ICP, ha_partition will read partition records to
table->record[0] and then will copy record away if it needs it to be
elsewhere.
117 lines
6.3 KiB
Text
117 lines
6.3 KiB
Text
#
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# MDEV-12404 Test Index Condition Pushdown for Partitioned Tables
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#
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--source include/have_partition.inc
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--source include/have_innodb.inc
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--source include/have_sequence.inc
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# Get current values of handler_icp_attempts and handler_icp_match as integers which we'll use to compare against later.
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set @old_handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @old_handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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# BLOBs are rejected by MyISAM
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CREATE TABLE t1 (a int PRIMARY KEY, b BLOB, c varchar(16) DEFAULT 'Filler...',
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INDEX (b(4), a)) ENGINE = MyISAM PARTITION BY HASH (a) PARTITIONS 3;
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INSERT INTO t1 (a, b) VALUES (1, 0xdeadbeef), (2, "text filler"),
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(3, 'filler...'), (4, " more filler "), (5, "test text"), (6, "testing...");
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SELECT a, HEX(b) FROM t1 WHERE b >= 'te' and (a % 2);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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# Verify that ICP was not invoked for isam (unsupported) by verifying that handler_icp_attempts and handler_icp_match are unchanged.
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select @old_handler_icp_attempts = @handler_icp_attempts;
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select @old_handler_icp_match = @handler_icp_match;
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# BLOBs allowed by InnoDB
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CREATE TABLE t2 (a int PRIMARY KEY, b BLOB, c varchar(16) DEFAULT 'Filler...',
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INDEX (b(4), a)) ENGINE = innodb PARTITION BY HASH (a) PARTITIONS 3;
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INSERT INTO t2 (a, b) VALUES (1, 0xdeadbeef), (2, "text filler"),
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(3, 'filler...'), (4, " more filler "), (5, "test text"), (6, "testing...");
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# Disable ICP and verify that ICP was not invoked by showing that handler_icp_attempts and handler_icp_match are unchanged.
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set @@optimizer_switch='index_condition_pushdown=off';
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SELECT a, HEX(b) FROM t2 WHERE b >= 'te' and (a % 2);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts = @handler_icp_attempts;
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select @old_handler_icp_match = @handler_icp_match;
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# Enable index condition pushdown then verify that the pushed condition was checked.
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set @@optimizer_switch='index_condition_pushdown=on';
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SELECT a, HEX(b) FROM t2 WHERE b >= 'te' and (a % 2);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts < @handler_icp_attempts;
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select @old_handler_icp_match < @handler_icp_match;
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CREATE TABLE t3 (
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pk INT PRIMARY KEY,
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a INT,
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b INT,
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c INT,
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filler varchar(100),
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key(a,b,c)
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) engine=innodb partition by hash(pk) partitions 4;
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INSERT INTO t3 SELECT seq, seq, seq, seq, 'hello' FROM seq_1_to_10000;
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# Disable ICP and verify that ICP was not invoked by verifying that handler_icp_attempts and handler_icp_match are unchanged.
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set @@optimizer_switch='index_condition_pushdown=off';
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set @old_handler_icp_attempts = @handler_icp_attempts;
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set @old_handler_icp_match = @handler_icp_match;
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SELECT * from t3 where a < 10 AND (b+1>3);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts = @handler_icp_attempts;
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select @old_handler_icp_match = @handler_icp_match;
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# Enable index condition pushdown then verify that the pushed condition was checked.
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set @@optimizer_switch='index_condition_pushdown=on';
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SELECT * from t3 where a < 10 AND (b+1>3);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts < @handler_icp_attempts;
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select @old_handler_icp_match < @handler_icp_match;
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CREATE TABLE t4 (
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pk INT PRIMARY KEY,
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a INT,
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b INT,
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c INT,
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filler varchar(100),
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key(a,b,c)
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) engine=myisam partition by hash(pk) partitions 4;
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INSERT INTO t4 SELECT seq, seq, seq, seq, 'hello' FROM seq_1_to_10000;
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# Disable ICP and verify that ICP was not invoked by verifying that handler_icp_attempts and handler_icp_match are unchanged.
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set @@optimizer_switch='index_condition_pushdown=off';
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set @old_handler_icp_attempts = @handler_icp_attempts;
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set @old_handler_icp_match = @handler_icp_match;
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SELECT * from t4 where a < 10 AND (b+1>3);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts = @handler_icp_attempts;
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select @old_handler_icp_match = @handler_icp_match;
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# Enable index condition pushdown, then verify that the pushed condition was checked.
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set @@optimizer_switch='index_condition_pushdown=on';
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SELECT * from t4 where a < 10 AND (b+1>3);
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set @handler_icp_attempts=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_attempts');
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set @handler_icp_match=(select cast(variable_value as int) from information_schema.session_status where variable_name='handler_icp_match');
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select @old_handler_icp_attempts < @handler_icp_attempts;
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select @old_handler_icp_match < @handler_icp_match;
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create table t5(pk int primary key, kp1 int, kp2 int, filler int, key(kp1, kp2)) partition by hash(pk) partitions 2;
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insert into t5 select seq, seq/40, seq, seq from seq_1_to_4000;
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select * from t5 where t5.kp1=10 and mod(t5.kp2,2)=1 and t5.kp2+1<401;
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drop table t1, t2, t3, t4, t5;
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--echo #
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--echo # End of 11.4 tests
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--echo #
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