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aa713f5ae2
EXPLAIN EXTENDED should always print the field item used in the left part of an equality expression from the SET clause of an update statement as a reference to table column. Approved by Oleksandr Byelkin <sanja@mariadb.com>
299 lines
7.7 KiB
Text
299 lines
7.7 KiB
Text
#
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# MariaDB tests for EXPLAIN UPDATE/DELETE.
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#
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--source include/have_partition.inc
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--disable_warnings
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drop table if exists t0, t1;
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--enable_warnings
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create table t0 (a int) engine=myisam;
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insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
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--echo #
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--echo # Tests for single-table DELETE
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--echo #
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explain select * from t0 where a=3;
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explain delete from t0 where a=3;
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--echo # DELETE without WHERE is a special case:
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explain delete from t0;
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create table t1 (a int, b int, filler char(100), key(a), key(b));
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insert into t1
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select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler'
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from t0 A, t0 B, t0 C;
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--echo # This should use an index, possible_keys=NULL because there is no WHERE
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explain delete from t1 order by a limit 2;
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--echo # This should use range, possible_keys={a,b}
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explain delete from t1 where a<20 and b < 10;
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--echo # This should use ALL + filesort
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explain delete from t1 order by a+1 limit 2;
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--echo # This should use range + using filesort
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explain delete from t1 where a<20 order by b limit 2;
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--echo # Try some subqueries:
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explain delete from t1 where a < (select max(a) from t0);
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explain delete from t1 where a < (select max(a) from t0 where a < t1.b);
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--echo #
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--echo # Tests for multi-table DELETE
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--echo #
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explain delete t1 from t0, t1 where t0.a = t1.a;
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drop table t0, t1;
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--echo # ###################################################################
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--echo # ## EXPLAIN UPDATE tests
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--echo # ###################################################################
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create table t0 (a int) engine=myisam;
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insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
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explain update t0 set a=3 where a=4;
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create table t1 (a int, b int, filler char(100), key(a), key(b));
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insert into t1
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select A.a+10*B.a + 10*C.a, A.a+10*B.a + 10*C.a, 'filler'
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from t0 A, t0 B, t0 C;
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explain update t1 set a=a+1 where 3>4;
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explain update t1 set a=a+1 where a=3 and a=4;
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--echo # This should use an index, possible_keys=NULL because there is no WHERE
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explain update t1 set a=a+1 order by a limit 2;
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--echo # This should use range, possible_keys={a,b}
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explain update t1 set filler='fooo' where a<20 and b < 10;
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--echo # This should use ALL + filesort
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explain update t1 set filler='fooo' order by a+1 limit 2;
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--echo # This should use range + using filesort
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explain update t1 set filler='fooo' where a<20 order by b limit 2;
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--echo # Try some subqueries:
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explain update t1 set filler='fooo' where a < (select max(a) from t0);
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explain update t1 set filler='fooo' where a < (select max(a) from t0 where a < t1.b);
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--echo #
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--echo # Tests for multi-table UPDATE
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--echo #
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explain update t0, t1 set t1.a=t1.a+1 where t0.a = t1.a;
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drop table t0, t1;
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--echo #
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--echo # Try DELETE ... RETURNING ...
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--echo #
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create table t0 (a int);
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insert into t0 values (1),(2),(3),(4);
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explain delete from t0 where a=1 returning a;
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explain delete from t0 returning a;
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drop table t0;
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--echo #
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--echo # MDEV-5070 - EXPLAIN INSERT ... SELECT crashes on 10.0-base-explain-slowquerylog
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--echo #
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create table t0 (a int);
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insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
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create table t1 (a int);
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explain insert into t1 select * from t0;
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explain replace into t1 select * from t0;
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drop table t0, t1;
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--echo #
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--echo # MDEV-5067: Valgrind warnings (Invalid read) in QPF_table_access::print_explain
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--echo #
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CREATE TABLE t1 (i INT) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (7),(0),(9);
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SELECT * FROM t1 INNER JOIN ( SELECT DISTINCT * FROM t1 ) AS sq ON (sq.i = t1.i);
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DROP TABLE t1;
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--echo #
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--echo # MDEV-5093, MDEV-5094: EXPLAIN PARTITIONS and EXPLAIN EXTENDED do not
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--echo # work for EXPLAIN UPDATE.
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--echo #
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create table t1 (i int);
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explain partitions update t1 set i = 3;
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create table t2 (a int, b int) partition by hash(a) partitions 5;
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insert into t2 values (0,0),(1,1),(2,2),(3,3),(4,4);
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explain partitions update t2 set b=3 where a in (3,4);
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explain partitions delete from t2 where a in (3,4);
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explain extended update t2 set b=3 where a in (3,4);
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explain extended delete from t2 where a in (3,4);
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drop table t1,t2;
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--echo #
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--echo # Check the special case where partition pruning removed all partitions
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--echo #
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create table t1 (a int, b int)
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partition by range (a) (
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partition p0 values less than (10),
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partition p1 values less than (20),
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partition p2 values less than (30)
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);
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insert into t1 values (9,9), (19,19), (29,29);
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explain partitions select * from t1 where a in (32,33);
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explain partitions delete from t1 where a in (32,33);
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explain partitions update t1 set b=12345 where a in (32,33);
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drop table t1;
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--echo #
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--echo # Tests for EXPLAIN INSERT ... VALUES
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--echo #
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create table t1 (a int, key(a));
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explain insert into t1 values (1),(2),(3);
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insert into t1 values (1),(2),(3);
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create table t2 (a int, b int);
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explain insert into t2 values
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(10, 1+(select max(a) from t1)),
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(11, 1+(select max(a+1) from t1));
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drop table t1,t2;
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--echo #
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--echo # MDEV-5122: "Commands out of sync", "Malformed packet" or client hang up on unique key violation
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--echo #
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drop table if exists t1;
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--disable_warnings
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drop function if exists f1;
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--enable_warnings
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create table t1 (a int, unique(a));
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delimiter |;
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create function f1(x int)
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returns int
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begin
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insert into t1 values(x),(x);
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return 10;
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end|
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delimiter ;|
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--error ER_DUP_ENTRY
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select f1(100);
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select 'OK';
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drop function f1;
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drop table t1;
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--echo #
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--echo # MDEV-7038: Assertion `status_var.memory_used == 0' failed in THD::~THD()
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--echo # on disconnect after executing EXPLAIN for multi-table UPDATE
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--echo #
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CREATE TABLE t1 (a INT);
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CREATE VIEW v1 AS SELECT * FROM t1;
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INSERT INTO t1 VALUES (1),(2);
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EXPLAIN UPDATE v1, mysql.user SET v1.a = v1.a + 1;
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DROP TABLE t1;
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DROP VIEW v1;
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--echo #
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--echo # MDEV-8299: MyISAM or Aria table gets corrupted after EXPLAIN INSERT and INSERT
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--echo #
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CREATE TABLE t1 (pk INT NOT NULL AUTO_INCREMENT PRIMARY KEY, i INT, KEY(i)) ENGINE=MyISAM;
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INSERT INTO t1 (i) VALUES (100),(200);
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CREATE TABLE t2 (j INT) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (10),(20);
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EXPLAIN INSERT INTO t1 (i) SELECT j FROM t2;
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INSERT INTO t1 (i) VALUES (300);
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CHECK TABLE t1;
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DROP TABLE t1, t2;
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--echo #
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--echo # MDEV-8321: Assertion `! is_set()' failed in Diagnostics_area::set_eof_status on EXPLAIN INSERT ... UNION
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--echo #
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CREATE TABLE t1 (a INT);
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CREATE TABLE t2 (b INT);
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CREATE TABLE t3 (c INT);
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# Data is not necessary, tables can be empty as well
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INSERT INTO t1 VALUES (1),(2);
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INSERT INTO t2 VALUES (3),(4);
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INSERT INTO t3 VALUES (5),(6);
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EXPLAIN INSERT INTO t1 SELECT * FROM t2 UNION SELECT * FROM t3;
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drop table t1,t2,t3;
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--echo #
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--echo # MDEV-6223: Assertion `! is_set()' fails in Diagnostics_area::set_eof_status on EXPLAIN INSERT executed as a PS
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--echo #
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CREATE TABLE t1 (a INT) ENGINE = MyISAM;
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CREATE TABLE t2 (b INT) ENGINE = MyISAM;
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INSERT INTO t2 VALUES (1),(2);
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PREPARE stmt FROM 'EXPLAIN INSERT INTO t1 SELECT * FROM t2';
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EXECUTE stmt;
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drop table t1,t2;
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--echo #
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--echo # MDEV-31181: EXPLAIN EXTENDED for single-table DELETE with IN predicand
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--echo #
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create table t1 (a int);
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insert into t1 values (3), (7), (1), (3), (4);
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create table t2 (pk int primary key);
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insert into t2 values (3), (5), (1);
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create table t3 (a int, key(a));
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insert into t3 values (7), (5), (7), (3);
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let $q1=
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delete from t1 where a in (select pk from t2);
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eval explain extended $q1;
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eval $q1;
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select * from t1;
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let $q2=
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delete from t1 where a in (select a from t3);
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eval explain extended $q2;
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eval $q2;
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select * from t1;
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drop table t1,t2,t3;
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--echo #
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--echo # MDEV-31224: EXPLAIN EXTENDED for multi-table update of system table
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--echo #
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CREATE TABLE t1 (a INT);
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INSERT INTO t1 VALUES (1),(2);
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CREATE TABLE t2 (b INT) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (3);
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let $q=
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UPDATE t1, t2 SET b = 4 WHERE a IN (6,2);
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eval EXPLAIN EXTENDED $q;
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eval $q;
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SELECT * from t2;
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DROP TABLE t1, t2;
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--echo # End of 10.4 tests
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