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4461edde0a
> ------------------------------------------------------------ > revno: 2772 > revision-id: joro@sun.com-20090615133815-eb007p5793in33p5 > parent: joro@sun.com-20090612140659-4hj1tta9p8wvcw4k > committer: Georgi Kodinov <joro@sun.com> > branch nick: B44810-5.0-bugteam > timestamp: Mon 2009-06-15 16:38:15 +0300 > message: > Bug #44810: index merge and order by with low sort_buffer_size > crashes server! > > The problem affects the scenario when index merge is followed by a filesort > and the sort buffer is not big enough for all the sort keys. > In this case the filesort function will read the data to the end through the > index merge quick access method (and thus closing the cursor etc), > but will leave the pointer to the quick select method in place. > It will then create a temporary file to hold the results of the filesort and > will add it as a sort output file (in sort.io_cache). > Note that filesort will copy the original 'sort' structure in an automatic > variable and restore it after it's done. > As a result at exiting filesort() we have a sort.io_cache filled in and > nothing else (as a result of close of the cursors at end of reading data > through index merge). > Now create_sort_index() will note that there is a select and will clean it up > (as it's been used already by filesort() reading the data in). While doing that > a special case in the index merge destructor will clean up the sort.io_cache, > assuming it's an output of the index merge method and is not needed anymore. > As a result the code that tries to read the data back from the filesort output > will get no data in both memory and disk and will crash. > > Fixed similarly to how filesort() does it : by copying the sort.io_cache structure > to a local variable, removing the pointer to the io_cache (so that it's not freed > by QUICK_INDEX_MERGE_SELECT::~QUICK_INDEX_MERGE_SELECT) and restoring the original > structure (together with the valid pointer) after the cleanup is done. > This is a safe thing to do because all the structures are already cleaned up by > hitting the end of the index merge's read method (QUICK_INDEX_MERGE_SELECT::get_next()) > and the cleanup code being written in a way that tolerates repeating cleanups.
582 lines
26 KiB
Text
582 lines
26 KiB
Text
drop table if exists t0, t1, t2, t3, t4;
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create table t0
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(
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key1 int not null,
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INDEX i1(key1)
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);
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alter table t0 add key2 int not null, add index i2(key2);
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alter table t0 add key3 int not null, add index i3(key3);
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alter table t0 add key4 int not null, add index i4(key4);
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alter table t0 add key5 int not null, add index i5(key5);
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alter table t0 add key6 int not null, add index i6(key6);
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alter table t0 add key7 int not null, add index i7(key7);
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alter table t0 add key8 int not null, add index i8(key8);
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update t0 set key2=key1,key3=key1,key4=key1,key5=key1,key6=key1,key7=key1,key8=1024-key1;
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analyze table t0;
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Table Op Msg_type Msg_text
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test.t0 analyze status OK
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explain select * from t0 where key1 < 3 or key1 > 1020;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 range i1 i1 4 NULL 78 Using where
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explain
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select * from t0 where key1 < 3 or key2 > 1020;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 45 Using sort_union(i1,i2); Using where
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select * from t0 where key1 < 3 or key2 > 1020;
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key1 key2 key3 key4 key5 key6 key7 key8
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1 1 1 1 1 1 1 1023
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2 2 2 2 2 2 2 1022
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1021 1021 1021 1021 1021 1021 1021 3
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1022 1022 1022 1022 1022 1022 1022 2
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1023 1023 1023 1023 1023 1023 1023 1
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1024 1024 1024 1024 1024 1024 1024 0
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explain select * from t0 where key1 < 3 or key2 <4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
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explain
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select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 11 Using sort_union(i1,i2); Using where
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select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
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key1 key2 key3 key4 key5 key6 key7 key8
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31 31 31 31 31 31 31 993
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32 32 32 32 32 32 32 992
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33 33 33 33 33 33 33 991
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34 34 34 34 34 34 34 990
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35 35 35 35 35 35 35 989
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36 36 36 36 36 36 36 988
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37 37 37 37 37 37 37 987
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38 38 38 38 38 38 38 986
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39 39 39 39 39 39 39 985
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explain select * from t0 ignore index (i2) where key1 < 3 or key2 <4;
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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 i1 NULL NULL NULL 1024 Using where
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explain select * from t0 where (key1 < 3 or key2 <4) and key3 = 50;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 ref i1,i2,i3 i3 4 const 1 Using where
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explain select * from t0 use index (i1,i2) where (key1 < 3 or key2 <4) and key3 = 50;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
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explain select * from t0 where (key1 > 1 or key2 > 2);
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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 i1,i2 NULL NULL NULL 1024 Using where
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explain select * from t0 force index (i1,i2) where (key1 > 1 or key2 > 2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 1024 Using sort_union(i1,i2); Using where
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explain
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select * from t0 where key1<3 or key2<3 or (key1>5 and key1<8) or
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(key1>10 and key1<12) or (key2>100 and key2<110);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 17 Using sort_union(i1,i2); Using where
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explain select * from t0 where key2 = 45 or key1 <=> null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 range i1,i2 i2 4 NULL 1 Using where
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explain select * from t0 where key2 = 45 or key1 is not null;
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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 i1,i2 NULL NULL NULL 1024 Using where
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explain select * from t0 where key2 = 45 or key1 is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 ref i2 i2 4 const 1
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explain select * from t0 where key2=10 or key3=3 or key4 <=> null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
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explain select * from t0 where key2=10 or key3=3 or key4 is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i2,i3 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
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explain select key1 from t0 where (key1 <=> null) or (key2 < 5) or
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(key3=10) or (key4 <=> null);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i4 i2,i3 4,4 NULL 6 Using sort_union(i2,i3); Using where
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explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or
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(key3=10) or (key4 <=> null);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i3,i4 i1,i3 4,4 NULL 6 Using sort_union(i1,i3); Using where
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explain select * from t0 where
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(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 5 or key6 < 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using sort_union(i1,i2); Using where
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explain
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select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 9 Using sort_union(i1,i2); Using where
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select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
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key1 key2 key3 key4 key5 key6 key7 key8
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1 1 1 1 1 1 1 1023
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2 2 2 2 2 2 2 1022
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3 3 3 3 3 3 3 1021
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4 4 4 4 4 4 4 1020
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5 5 5 5 5 5 5 1019
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explain select * from t0 where
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(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 2 or key6 < 2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using sort_union(i1,i2); Using where
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explain select * from t0 where
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(key1 < 3 or key2 < 3) and (key3 < 100);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 range i1,i2,i3 i3 4 NULL 95 Using where
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explain select * from t0 where
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(key1 < 3 or key2 < 3) and (key3 < 1000);
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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 i1,i2,i3 NULL NULL NULL 1024 Using where
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explain select * from t0 where
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((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
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or
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key2 > 5;
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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 i1,i2,i3 NULL NULL NULL 1024 Using where
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explain select * from t0 where
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((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
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or
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key1 < 7;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 10 Using sort_union(i1,i2); Using where
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select * from t0 where
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((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
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or
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key1 < 7;
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key1 key2 key3 key4 key5 key6 key7 key8
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1 1 1 1 1 1 1 1023
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2 2 2 2 2 2 2 1022
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3 3 3 3 3 3 3 1021
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4 4 4 4 4 4 4 1020
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5 5 5 5 5 5 5 1019
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6 6 6 6 6 6 6 1018
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explain select * from t0 where
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((key1 < 4 or key2 < 4) and (key3 <5 or key5 < 4))
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or
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((key5 < 5 or key6 < 6) and (key7 <7 or key8 < 4));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i1,i2,i5,i6 4,4,4,4 NULL 19 Using sort_union(i1,i2,i5,i6); Using where
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explain select * from t0 where
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((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
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or
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((key7 <7 or key8 < 4) and (key5 < 5 or key6 < 6));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i3,i5,i7,i8 4,4,4,4 NULL 20 Using sort_union(i3,i5,i7,i8); Using where
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explain select * from t0 where
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((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
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or
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((key3 <7 or key5 < 2) and (key5 < 5 or key6 < 6));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 11 Using sort_union(i3,i5); Using where
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explain select * from t0 where
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((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
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or
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(((key3 <7 and key7 < 6) or key5 < 2) and (key5 < 5 or key6 < 6));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7 i3,i5 4,4 NULL 11 Using sort_union(i3,i5); Using where
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explain select * from t0 where
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((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
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or
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((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
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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 i1,i2,i3,i5,i6 NULL NULL NULL 1024 Using where
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explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
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((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
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or
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((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 0,4 NULL 1024 Using sort_union(i3,i5); Using where
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select * from t0 where key1 < 5 or key8 < 4 order by key1;
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key1 key2 key3 key4 key5 key6 key7 key8
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1 1 1 1 1 1 1 1023
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2 2 2 2 2 2 2 1022
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3 3 3 3 3 3 3 1021
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4 4 4 4 4 4 4 1020
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1021 1021 1021 1021 1021 1021 1021 3
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1022 1022 1022 1022 1022 1022 1022 2
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1023 1023 1023 1023 1023 1023 1023 1
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1024 1024 1024 1024 1024 1024 1024 0
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explain
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select * from t0 where key1 < 5 or key8 < 4 order by key1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i8 i1,i8 4,4 NULL 9 Using sort_union(i1,i8); Using where; Using filesort
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create table t2 like t0;
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insert into t2 select * from t0;
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alter table t2 add index i1_3(key1, key3);
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alter table t2 add index i2_3(key2, key3);
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alter table t2 drop index i1;
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alter table t2 drop index i2;
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alter table t2 add index i321(key3, key2, key1);
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explain select key3 from t2 where key1 = 100 or key2 = 100;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index_merge i1_3,i2_3 i1_3,i2_3 4,4 NULL 2 Using sort_union(i1_3,i2_3); Using where
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explain select key3 from t2 where key1 <100 or key2 < 100;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index i1_3,i2_3 i321 12 NULL 1024 Using where; Using index
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explain select key7 from t2 where key1 <100 or key2 < 100;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL i1_3,i2_3 NULL NULL NULL 1024 Using where
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create table t4 (
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key1a int not null,
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key1b int not null,
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key2 int not null,
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key2_1 int not null,
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key2_2 int not null,
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key3 int not null,
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index i1a (key1a, key1b),
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index i1b (key1b, key1a),
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index i2_1(key2, key2_1),
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index i2_2(key2, key2_1)
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);
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insert into t4 select key1,key1,key1 div 10, key1 % 10, key1 % 10, key1 from t0;
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select * from t4 where key1a = 3 or key1b = 4;
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key1a key1b key2 key2_1 key2_2 key3
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3 3 0 3 3 3
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4 4 0 4 4 4
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explain select * from t4 where key1a = 3 or key1b = 4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 index_merge i1a,i1b i1a,i1b 4,4 NULL 2 Using sort_union(i1a,i1b); Using where
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explain select * from t4 where key2 = 1 and (key2_1 = 1 or key3 = 5);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t4 ref i2_1,i2_2 i2_1 4 const 10 Using where
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explain select * from t4 where key2 = 1 and (key2_1 = 1 or key2_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 t4 ref i2_1,i2_2 i2_1 4 const 10 Using where
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explain select * from t4 where key2_1 = 1 or key2_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 t4 ALL NULL NULL NULL NULL 1024 Using where
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create table t1 like t0;
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insert into t1 select * from t0;
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explain select * from t0 left join t1 on (t0.key1=t1.key1)
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where t0.key1=3 or t0.key2=4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
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1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
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select * from t0 left join t1 on (t0.key1=t1.key1)
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where t0.key1=3 or t0.key2=4;
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key1 key2 key3 key4 key5 key6 key7 key8 key1 key2 key3 key4 key5 key6 key7 key8
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3 3 3 3 3 3 3 1021 3 3 3 3 3 3 3 1021
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4 4 4 4 4 4 4 1020 4 4 4 4 4 4 4 1020
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explain
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select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
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1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
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explain
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select * from t0,t1 where (t0.key1=t1.key1) and
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(t0.key1=3 or t0.key2=4) and t1.key1<200;
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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 i1,i2 NULL NULL NULL 1024 Using where
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1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
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explain
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select * from t0,t1 where (t0.key1=t1.key1) and
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(t0.key1=3 or t0.key2<4) and t1.key1=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 ref i1,i2 i1 4 const 1 Using where
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1 SIMPLE t1 ref i1 i1 4 const 1
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explain select * from t0,t1 where t0.key1 = 5 and
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(t1.key1 = t0.key1 or t1.key8 = t0.key1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 ref i1 i1 4 const 1
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1 SIMPLE t1 index_merge i1,i8 i1,i8 4,4 NULL 2 Using union(i1,i8); Using where
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explain select * from t0,t1 where t0.key1 < 3 and
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(t1.key1 = t0.key1 or t1.key8 = t0.key1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t0 range i1 i1 4 NULL 3 Using where
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1 SIMPLE t1 ALL i1,i8 NULL NULL NULL 1024 Range checked for each record (index map: 0x81)
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explain select * from t1 where key1=3 or key2=4
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union select * from t1 where key1<4 or key3=5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
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2 UNION t1 index_merge i1,i3 i1,i3 4,4 NULL 5 Using sort_union(i1,i3); Using where
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 1
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2 DERIVED t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where; Using index
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create table t3 like t0;
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insert into t3 select * from t0;
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alter table t3 add key9 int not null, add index i9(key9);
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alter table t3 add keyA int not null, add index iA(keyA);
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|
alter table t3 add keyB int not null, add index iB(keyB);
|
|
alter table t3 add keyC int not null, add index iC(keyC);
|
|
update t3 set key9=key1,keyA=key1,keyB=key1,keyC=key1;
|
|
explain select * from t3 where
|
|
key1=1 or key2=2 or key3=3 or key4=4 or
|
|
key5=5 or key6=6 or key7=7 or key8=8 or
|
|
key9=9 or keyA=10 or keyB=11 or keyC=12;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t3 index_merge i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC 4,4,4,4,4,4,4,4,4,4,4,4 NULL 12 Using union(i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC); Using where
|
|
select * from t3 where
|
|
key1=1 or key2=2 or key3=3 or key4=4 or
|
|
key5=5 or key6=6 or key7=7 or key8=8 or
|
|
key9=9 or keyA=10 or keyB=11 or keyC=12;
|
|
key1 key2 key3 key4 key5 key6 key7 key8 key9 keyA keyB keyC
|
|
1 1 1 1 1 1 1 1023 1 1 1 1
|
|
2 2 2 2 2 2 2 1022 2 2 2 2
|
|
3 3 3 3 3 3 3 1021 3 3 3 3
|
|
4 4 4 4 4 4 4 1020 4 4 4 4
|
|
5 5 5 5 5 5 5 1019 5 5 5 5
|
|
6 6 6 6 6 6 6 1018 6 6 6 6
|
|
7 7 7 7 7 7 7 1017 7 7 7 7
|
|
9 9 9 9 9 9 9 1015 9 9 9 9
|
|
10 10 10 10 10 10 10 1014 10 10 10 10
|
|
11 11 11 11 11 11 11 1013 11 11 11 11
|
|
12 12 12 12 12 12 12 1012 12 12 12 12
|
|
1016 1016 1016 1016 1016 1016 1016 8 1016 1016 1016 1016
|
|
explain select * from t0 where key1 < 3 or key2 < 4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
key1 key2 key3 key4 key5 key6 key7 key8
|
|
1 1 1 1 1 1 1 1023
|
|
2 2 2 2 2 2 2 1022
|
|
3 3 3 3 3 3 3 1021
|
|
update t0 set key8=123 where key1 < 3 or key2 < 4;
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
key1 key2 key3 key4 key5 key6 key7 key8
|
|
1 1 1 1 1 1 1 123
|
|
2 2 2 2 2 2 2 123
|
|
3 3 3 3 3 3 3 123
|
|
delete from t0 where key1 < 3 or key2 < 4;
|
|
select * from t0 where key1 < 3 or key2 < 4;
|
|
key1 key2 key3 key4 key5 key6 key7 key8
|
|
select count(*) from t0;
|
|
count(*)
|
|
1021
|
|
drop table t4;
|
|
create table t4 (a int);
|
|
insert into t4 values (1),(4),(3);
|
|
set @save_join_buffer_size=@@join_buffer_size;
|
|
set join_buffer_size= 4000;
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect join_buffer_size value: '4000'
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 < 500000 or A.key2 < 3)
|
|
and (B.key1 < 500000 or B.key2 < 3);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE A index_merge i1,i2 i1,i2 4,4 NULL 1013 Using sort_union(i1,i2); Using where
|
|
1 SIMPLE B index_merge i1,i2 i1,i2 4,4 NULL 1013 Using sort_union(i1,i2); Using where
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 < 500000 or A.key2 < 3)
|
|
and (B.key1 < 500000 or B.key2 < 3);
|
|
max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
10240
|
|
update t0 set key1=1;
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 = 1 or A.key2 = 1)
|
|
and (B.key1 = 1 or B.key2 = 1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE A index_merge i1,i2 i1,i2 4,4 NULL 1020 Using union(i1,i2); Using where
|
|
1 SIMPLE B index_merge i1,i2 i1,i2 4,4 NULL 1020 Using union(i1,i2); Using where
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
|
|
where (A.key1 = 1 or A.key2 = 1)
|
|
and (B.key1 = 1 or B.key2 = 1);
|
|
max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
8194
|
|
alter table t0 add filler1 char(200), add filler2 char(200), add filler3 char(200);
|
|
update t0 set key2=1, key3=1, key4=1, key5=1,key6=1,key7=1 where key7 < 500;
|
|
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A, t0 as B
|
|
where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)
|
|
and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE A index_merge i1,i2,i3,i4,i5,i6,i7?,i8 i2,i3,i4,i5,i6,i7?,i8 X NULL # Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
|
|
1 SIMPLE B index_merge i1,i2,i3,i4,i5,i6,i7?,i8 i2,i3,i4,i5,i6,i7?,i8 X NULL # Using union(intersect(i2,i3,i4,i5,i6,i7?),i8); Using where
|
|
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
from t0 as A, t0 as B
|
|
where (A.key1 = 1 and A.key2 = 1 and A.key3 = 1 and A.key4=1 and A.key5=1 and A.key6=1 and A.key7 = 1 or A.key8=1)
|
|
and (B.key1 = 1 and B.key2 = 1 and B.key3 = 1 and B.key4=1 and B.key5=1 and B.key6=1 and B.key7 = 1 or B.key8=1);
|
|
max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5)
|
|
8186
|
|
set join_buffer_size= @save_join_buffer_size;
|
|
drop table t0, t1, t2, t3, t4;
|
|
CREATE TABLE t1 (
|
|
cola char(3) not null, colb char(3) not null, filler char(200),
|
|
key(cola), key(colb)
|
|
);
|
|
INSERT INTO t1 VALUES ('foo','bar', 'ZZ'),('fuz','baz', 'ZZ');
|
|
OPTIMIZE TABLE t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 optimize status OK
|
|
select count(*) from t1;
|
|
count(*)
|
|
8704
|
|
explain select * from t1 WHERE cola = 'foo' AND colb = 'bar';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index_merge cola,colb cola,colb 3,3 NULL 24 Using intersect(cola,colb); Using where
|
|
explain select * from t1 force index(cola,colb) WHERE cola = 'foo' AND colb = 'bar';
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index_merge cola,colb cola,colb 3,3 NULL 24 Using intersect(cola,colb); Using where
|
|
drop table t1;
|
|
create table t0 (a int);
|
|
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
|
create table t1 (
|
|
a int, b int,
|
|
filler1 char(200), filler2 char(200),
|
|
key(a),key(b)
|
|
);
|
|
insert into t1 select @v:= A.a, @v, 't1', 'filler2' from t0 A, t0 B, t0 C;
|
|
create table t2 like t1;
|
|
create table t3 (
|
|
a int, b int,
|
|
filler1 char(200), filler2 char(200),
|
|
key(a),key(b)
|
|
) engine=merge union=(t1,t2);
|
|
explain select * from t1 where a=1 and b=1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index_merge a,b a,b 5,5 NULL # Using intersect(a,b); Using where
|
|
explain select * from t3 where a=1 and b=1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t3 index_merge a,b a,b 5,5 NULL # Using intersect(a,b); Using where
|
|
drop table t3;
|
|
drop table t0, t1, t2;
|
|
CREATE TABLE t1(a INT);
|
|
INSERT INTO t1 VALUES(1);
|
|
CREATE TABLE t2(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b));
|
|
INSERT INTO t2(a,b) VALUES
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
|
|
(1,2);
|
|
LOCK TABLES t1 WRITE, t2 WRITE;
|
|
INSERT INTO t2(a,b) VALUES(1,2);
|
|
SELECT t2.a FROM t1,t2 WHERE t2.b=2 AND t2.a=1;
|
|
a
|
|
1
|
|
1
|
|
UNLOCK TABLES;
|
|
DROP TABLE t1, t2;
|
|
CREATE TABLE `t1` (
|
|
`a` int(11) DEFAULT NULL,
|
|
`filler` char(200) DEFAULT NULL,
|
|
`b` int(11) DEFAULT NULL,
|
|
KEY `a` (`a`),
|
|
KEY `b` (`b`)
|
|
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
|
|
insert into t1 values
|
|
(0, 'filler', 0), (1, 'filler', 1), (2, 'filler', 2), (3, 'filler', 3),
|
|
(4, 'filler', 4), (5, 'filler', 5), (6, 'filler', 6), (7, 'filler', 7),
|
|
(8, 'filler', 8), (9, 'filler', 9), (0, 'filler', 0), (1, 'filler', 1),
|
|
(2, 'filler', 2), (3, 'filler', 3), (4, 'filler', 4), (5, 'filler', 5),
|
|
(6, 'filler', 6), (7, 'filler', 7), (8, 'filler', 8), (9, 'filler', 9),
|
|
(10, 'filler', 10), (11, 'filler', 11), (12, 'filler', 12), (13, 'filler', 13),
|
|
(14, 'filler', 14), (15, 'filler', 15), (16, 'filler', 16), (17, 'filler', 17),
|
|
(18, 'filler', 18), (19, 'filler', 19), (4, '5 ', 0), (5, '4 ', 0),
|
|
(4, '4 ', 0), (4, 'qq ', 5), (5, 'qq ', 4), (4, 'zz ', 4);
|
|
create table t2(
|
|
`a` int(11) DEFAULT NULL,
|
|
`filler` char(200) DEFAULT NULL,
|
|
`b` int(11) DEFAULT NULL,
|
|
KEY USING BTREE (`a`),
|
|
KEY USING BTREE (`b`)
|
|
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
|
|
insert into t2 select * from t1;
|
|
must use sort-union rather than union:
|
|
explain select * from t1 where a=4 or b=4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index_merge a,b a,b 5,5 NULL # Using sort_union(a,b); Using where
|
|
select * from t1 where a=4 or b=4;
|
|
a filler b
|
|
4 4 0
|
|
4 5 0
|
|
4 filler 4
|
|
4 filler 4
|
|
4 qq 5
|
|
4 zz 4
|
|
5 qq 4
|
|
select * from t1 ignore index(a,b) where a=4 or b=4;
|
|
a filler b
|
|
4 4 0
|
|
4 5 0
|
|
4 filler 4
|
|
4 filler 4
|
|
4 qq 5
|
|
4 zz 4
|
|
5 qq 4
|
|
must use union, not sort-union:
|
|
explain select * from t2 where a=4 or b=4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 index_merge a,b a,b 5,5 NULL # Using union(a,b); Using where
|
|
select * from t2 where a=4 or b=4;
|
|
a filler b
|
|
4 4 0
|
|
4 5 0
|
|
4 filler 4
|
|
4 filler 4
|
|
4 qq 5
|
|
4 zz 4
|
|
5 qq 4
|
|
drop table t1, t2;
|
|
CREATE TABLE t1 (a varchar(8), b set('a','b','c','d','e','f','g','h'),
|
|
KEY b(b), KEY a(a));
|
|
INSERT INTO t1 VALUES ('y',''), ('z','');
|
|
SELECT b,a from t1 WHERE (b!='c' AND b!='f' && b!='h') OR
|
|
(a='pure-S') OR (a='DE80337a') OR (a='DE80799');
|
|
b a
|
|
y
|
|
z
|
|
DROP TABLE t1;
|
|
#
|
|
# BUG#40974: Incorrect query results when using clause evaluated using range check
|
|
#
|
|
create table t0 (a int);
|
|
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
|
create table t1 (a int);
|
|
insert into t1 values (1),(2);
|
|
create table t2(a int, b int);
|
|
insert into t2 values (1,1), (2, 1000);
|
|
create table t3 (a int, b int, filler char(100), key(a), key(b));
|
|
insert into t3 select 1000, 1000,'filler' from t0 A, t0 B, t0 C;
|
|
insert into t3 values (1,1,'data');
|
|
insert into t3 values (1,1,'data');
|
|
The plan should be ALL/ALL/ALL(Range checked for each record (index map: 0x3)
|
|
explain select * from t1
|
|
where exists (select 1 from t2, t3
|
|
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
|
|
2 DEPENDENT SUBQUERY t3 ALL a,b NULL NULL NULL 1002 Range checked for each record (index map: 0x3)
|
|
select * from t1
|
|
where exists (select 1 from t2, t3
|
|
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
|
|
a
|
|
1
|
|
2
|
|
drop table t0, t1, t2, t3;
|
|
#
|
|
# BUG#44810: index merge and order by with low sort_buffer_size
|
|
# crashes server!
|
|
#
|
|
CREATE TABLE t1(a VARCHAR(128),b VARCHAR(128),KEY(A),KEY(B));
|
|
INSERT INTO t1 VALUES (REPEAT('a',128),REPEAT('b',128));
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
INSERT INTO t1 SELECT * FROM t1;
|
|
SET SESSION sort_buffer_size=1;
|
|
Warnings:
|
|
Warning 1292 Truncated incorrect sort_buffer_size value: '1'
|
|
EXPLAIN
|
|
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%'
|
|
ORDER BY a,b;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index_merge a,b a,b 131,131 NULL 64 Using sort_union(a,b); Using where; Using filesort
|
|
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%'
|
|
ORDER BY a,b;
|
|
SET SESSION sort_buffer_size=DEFAULT;
|
|
DROP TABLE t1;
|
|
End of 5.0 tests
|