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07df2029a3
Creating a record from the join cache is faster than getting a row from the engine (less and simpler code to execute). Added JOIN_CACHE_ROW_COPY_COST_FACTOR (0.5 for now) as the factor to take this into account. This is multiplied with ROW_COPY_COST. Other things: - Added cost of copying rows to hash join, similar to join_cache joins.
93 lines
2.6 KiB
Text
93 lines
2.6 KiB
Text
#
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# test of safe selects
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#
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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SET SQL_SAFE_UPDATES=1,SQL_SELECT_LIMIT=4, MAX_JOIN_SIZE=9;
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create table t1 (a int auto_increment primary key, b char(20));
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insert into t1 values(1,"test");
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SELECT SQL_BUFFER_RESULT * from t1;
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update t1 set b="a" where a=1;
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delete from t1 where a=1;
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insert into t1 values(1,"test"),(2,"test2");
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SELECT SQL_BUFFER_RESULT * from t1;
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update t1 set b="a" where a=1;
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select 1 from t1,t1 as t2,t1 as t3;
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# The following should give errors:
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--error 1175
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update t1 set b="a";
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--error 1175
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update t1 set b="a" where b="test";
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--error 1175
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delete from t1;
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--error 1175
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delete from t1 where b="test";
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--error 1175
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delete from t1 where a+0=1;
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--error 1104
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select 1 from t1,t1 as t2,t1 as t3,t1 as t4,t1 as t5;
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# The following should be ok:
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update t1 set b="a" limit 1;
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update t1 set b="a" where b="b" limit 2;
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delete from t1 where b="test" limit 1;
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delete from t1 where a+0=1 limit 2;
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# Test SQL_BIG_SELECTS
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alter table t1 add key b (b);
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SET MAX_JOIN_SIZE=2;
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SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
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insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
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--error 1104
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SELECT * from t1 order by a;
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SET SQL_BIG_SELECTS=1;
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SELECT * from t1 order by a;
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SET MAX_JOIN_SIZE=2;
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--error 1104
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SELECT * from t1;
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SET MAX_JOIN_SIZE=DEFAULT;
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SELECT * from t1;
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#
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# Test MAX_SEEKS_FOR_KEY
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#
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analyze table t1;
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insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
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insert into t1 values (null,"b"),(null,"b"),(null,"c"),(null,"c"),(null,"d"),(null,"d"),(null,"e"),(null,"e"),(null,"a"),(null,"e");
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insert into t1 values (null,"x"),(null,"x"),(null,"y"),(null,"y"),(null,"z"),(null,"z"),(null,"v"),(null,"v"),(null,"a"),(null,"v");
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set @@optimizer_where_cost=0.3;
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explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
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set MAX_SEEKS_FOR_KEY=1;
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explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
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SET MAX_SEEKS_FOR_KEY=DEFAULT;
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drop table t1;
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# BUG#8726
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create table t1 (a int);
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insert into t1 values (1),(2),(3),(4),(5);
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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set local max_join_size=8;
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--error 1104
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select * from (select * from t1) x;
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set local max_join_size=1;
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--error 1104
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select * from (select a.a as aa, b.a as ba from t1 a, t1 b) x;
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set local max_join_size=1;
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--error 1104
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select * from (select 1 union select 2 union select 3) x;
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drop table t1;
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SET SQL_SAFE_UPDATES=0,SQL_SELECT_LIMIT=DEFAULT, MAX_JOIN_SIZE=DEFAULT;
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# End of 4.1 tests
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