mirror of
https://github.com/MariaDB/server.git
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eb483c5181
- multi_range_read_info_const now uses the new records_in_range interface - Added handler::avg_io_cost() - Don't calculate avg_io_cost() in get_sweep_read_cost if avg_io_cost is not 1.0. In this case we trust the avg_io_cost() from the handler. - Changed test_quick_select to use TIME_FOR_COMPARE instead of TIME_FOR_COMPARE_IDX to align this with the rest of the code. - Fixed bug when using test_if_cheaper_ordering where we didn't use keyread if index was changed - Fixed a bug where we didn't use index only read when using order-by-index - Added keyread_time() to HEAP. The default keyread_time() was optimized for blocks and not suitable for HEAP. The effect was the HEAP prefered table scans over ranges for btree indexes. - Fixed get_sweep_read_cost() for HEAP tables - Ensure that range and ref have same cost for simple ranges Added a small cost (MULTI_RANGE_READ_SETUP_COST) to ranges to ensure we favior ref for range for simple queries. - Fixed that matching_candidates_in_table() uses same number of records as the rest of the optimizer - Added avg_io_cost() to JT_EQ_REF cost. This helps calculate the cost for HEAP and temporary tables better. A few tests changed because of this. - heap::read_time() and heap::keyread_time() adjusted to not add +1. This was to ensure that handler::keyread_time() doesn't give higher cost for heap tables than for normal tables. One effect of this is that heap and derived tables stored in heap will prefer key access as this is now regarded as cheap. - Changed cost for index read in sql_select.cc to match multi_range_read_info_const(). All index cost calculation is now done trough one function. - 'ref' will now use quick_cost for keys if it exists. This is done so that for '=' ranges, 'ref' is prefered over 'range'. - scan_time() now takes avg_io_costs() into account - get_delayed_table_estimates() uses block_size and avg_io_cost() - Removed default argument to test_if_order_by_key(); simplifies code
267 lines
5.8 KiB
Plaintext
267 lines
5.8 KiB
Plaintext
create temporary table t1 (i int) engine = innodb;
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insert into t1 values (1), (2), (3), (4);
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select * from t1;
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i
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1
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2
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3
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4
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select * from t1 where i = 4;
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i
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4
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drop table t1;
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create temporary table t1 (i int) engine = innodb;
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insert into t1 values (1), (2), (3), (4);
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select * from t1;
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i
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1
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2
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3
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4
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select * from t1 where i = 4;
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i
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4
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drop table t1;
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create temporary table t2 (i int) engine = innodb;
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insert into t2 values (1), (2), (3), (4);
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select * from t2;
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i
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1
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2
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3
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4
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select * from t2 where i = 4;
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i
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4
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drop table t2;
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create temporary table t1
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(keyc int, c1 char(100), c2 char(100),
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primary key(keyc)) engine = innodb;
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create procedure populate_t1()
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begin
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declare i int default 1;
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while (i <= 200) DO
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insert into t1 values (i, 'a', 'b');
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set i = i + 1;
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end while;
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end|
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set autocommit=0;
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select count(*) from t1;
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count(*)
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0
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call populate_t1();
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select count(*) from t1;
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count(*)
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200
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select * from t1 limit 10;
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keyc c1 c2
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1 a b
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2 a b
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3 a b
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4 a b
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5 a b
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6 a b
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7 a b
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8 a b
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9 a b
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10 a b
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set autocommit=1;
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truncate table t1;
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select count(*) from t1;
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count(*)
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0
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drop table t1;
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create temporary table t1 (i int) engine = innodb;
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insert into t1 values (1), (2), (3), (4);
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select * from t1;
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i
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1
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2
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3
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4
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select * from t1 where i = 4;
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i
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4
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drop table t1;
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create temporary table t1
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(keyc int, c1 char(100), c2 char(100),
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primary key(keyc))
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engine = innodb;
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begin;
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select count(*) from t1;
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count(*)
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0
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call populate_t1();
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select count(*) from t1;
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count(*)
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200
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rollback;
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select count(*) from t1;
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count(*)
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0
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begin;
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call populate_t1();
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commit;
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select count(*) from t1;
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count(*)
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200
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truncate table t1;
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select count(*) from t1;
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count(*)
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0
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drop table t1;
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drop procedure populate_t1;
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create temporary table t1 (t1_i int, t1_f float) engine = innodb;
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insert into t1 values (1, 1.1), (2, 2.5), (3, 2.5), (4, 4.4);
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explain select * from t1 where t1_i = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where
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alter table t1 add unique index pri_index(t1_i);
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explain select * from t1 where t1_i = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const pri_index pri_index 5 const 1
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select * from t1 where t1_i = 1;
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t1_i t1_f
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1 1.1
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alter table t1 add unique index sec_index(t1_f);
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ERROR 23000: Duplicate entry '2.5' for key 'sec_index'
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alter table t1 add index sec_index(t1_f);
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explain select * from t1 where t1_f >= 2.5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range sec_index sec_index 5 NULL 3 Using index condition
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select * from t1 where t1_f >= 2.5;
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t1_i t1_f
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2 2.5
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3 2.5
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4 4.4
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alter table t1 add column (t1_c char(10));
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select * from t1;
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t1_i t1_f t1_c
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1 1.1 NULL
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2 2.5 NULL
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3 2.5 NULL
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4 4.4 NULL
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insert into t1 values (5, 5.5, 'krunal');
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alter table t1 drop column t1_f;
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show create table t1;
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Table Create Table
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t1 CREATE TEMPORARY TABLE `t1` (
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`t1_i` int(11) DEFAULT NULL,
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`t1_c` char(10) DEFAULT NULL,
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UNIQUE KEY `pri_index` (`t1_i`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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select * from t1 where t1_f >= 2.5;
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ERROR 42S22: Unknown column 't1_f' in 'where clause'
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alter table t1 add index sec_index2(t1_c), algorithm=inplace;
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ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY
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drop table t1;
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create temporary table t1 (i int, f float) engine = innodb;
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insert into t1 values (10, 1.1), (20, 2.2);
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select * from t1;
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i f
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10 1.1
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20 2.2
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alter table t1 discard tablespace;
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ERROR HY000: Cannot DISCARD/IMPORT tablespace associated with temporary table
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alter table t1 import tablespace;
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ERROR HY000: Cannot DISCARD/IMPORT tablespace associated with temporary table
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drop table t1;
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create temporary table t1 (i int) engine=innodb;
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insert into t1 values (1), (2), (3);
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select * from t1;
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i
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1
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2
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3
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alter table t1 rename t2;
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select * from t1;
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ERROR 42S02: Table 'test.t1' doesn't exist
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select * from t2;
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i
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1
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2
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3
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insert into t2 values (1), (2), (6), (7);
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select * from t2;
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i
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1
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2
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3
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1
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2
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6
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7
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drop table t2;
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SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = dynamic engine=innodb;
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drop table t;
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = dynamic engine=innodb;
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drop table t;
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = dynamic engine=innodb;
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drop table t;
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SET innodb_strict_mode=OFF;
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = compact engine=innodb;
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ERROR HY000: Index column size too large. The maximum column size is 767 bytes
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = dynamic engine=innodb;
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drop table t;
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = compressed engine=innodb;
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drop table t;
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = compact engine=innodb;
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ERROR HY000: Index column size too large. The maximum column size is 767 bytes
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create temporary table t (
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a int not null,
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b blob not null,
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index sk (b(3021))
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) row_format = dynamic engine=innodb;
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drop table t;
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CREATE TABLE t1 ( i INT ) ENGINE = Innodb;
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CREATE TEMPORARY TABLE t2 ( i INT ) ENGINE = Innodb;
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_DATAFILES WHERE PATH LIKE '%test%t_';
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COUNT(*)
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0
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_TABLES WHERE NAME LIKE '%test%t_';
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COUNT(*)
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1
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CREATE TEMPORARY table t3 ( i INT ) ENGINE = Innodb;
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_DATAFILES WHERE PATH LIKE '%test%t_';
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COUNT(*)
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0
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_TABLES WHERE NAME LIKE '%test%t_';
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COUNT(*)
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1
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DROP TABLE t1,t2,t3;
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_DATAFILES WHERE PATH LIKE '%test%t_';
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COUNT(*)
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0
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SELECT COUNT(*) FROM information_schema.INNODB_SYS_TABLES WHERE NAME LIKE '%test%t_';
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COUNT(*)
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0
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