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BUG#1000051: Query with simple join and ORDER BY takes thousands times longer when run with ICP
- Correct testcases.
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1d3ba8a791
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2 changed files with 16 additions and 11 deletions
mysql-test
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@ -915,15 +915,17 @@ DROP TABLE t1,t2,t3,t4;
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, col int, filler char(100), key(a, col));
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insert into t1 select A.a + 10*B.a +100*C.a, 1234, 'filler' from t0 A, t0 B, t0 C;
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insert into t1 select A.a + 10*B.a, 1234, 'filler' from t0 A, t0 B, t0 C;
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set @tmp_10000051= @@optimizer_switch;
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set optimizer_switch='mrr=off';
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# Must not use ICP:
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explain select * from t1 where a between 10 and 20 order by a, col desc;
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explain select * from t1 where a between 5 and 8 order by a desc, col desc;
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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 a a 5 NULL 11 Using index condition; Rowid-ordered scan; Using filesort
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1 SIMPLE t1 range a a 5 NULL 39 Using where
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set optimizer_switch= @tmp_10000051;
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# Must not use ICP:
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explain select * from t0,t1 where t1.a=t0.a and t1.col<123;
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explain select * from t1 where a=3 and col > 500 order by a desc, col desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where
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1 SIMPLE t1 ref a a 5 test.t0.a 1 Using index condition
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1 SIMPLE t1 range a a 10 NULL 10 Using where
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drop table t0, t1;
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set optimizer_switch=@myisam_icp_tmp;
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@ -269,13 +269,16 @@ create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, col int, filler char(100), key(a, col));
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insert into t1 select A.a + 10*B.a +100*C.a, 1234, 'filler' from t0 A, t0 B, t0 C;
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insert into t1 select A.a + 10*B.a, 1234, 'filler' from t0 A, t0 B, t0 C;
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set @tmp_10000051= @@optimizer_switch;
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set optimizer_switch='mrr=off';
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--echo # Must not use ICP:
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explain select * from t1 where a between 5 and 8 order by a desc, col desc;
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set optimizer_switch= @tmp_10000051;
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--echo # Must not use ICP:
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explain select * from t1 where a between 10 and 20 order by a, col desc;
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--echo # Must not use ICP:
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explain select * from t0,t1 where t1.a=t0.a and t1.col<123;
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explain select * from t1 where a=3 and col > 500 order by a desc, col desc;
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drop table t0, t1;
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