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9a4110aa57
The problem was an assignment in test_quick_select() that flagged empty tables with "Impossible where". This test was however wrong as it didn't work correctly for left join. Removed the test, but added checking of empty tables in DELETE and UPDATE to get similar EXPLAIN as before. The new tests is a bit more strict (better) than before as it catches all cases of empty tables in single table DELETE/UPDATE.
337 lines
14 KiB
Text
337 lines
14 KiB
Text
set join_cache_level=2;
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drop table if exists t0,t1,t2,t3;
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create table t0 (a int) engine=myisam;
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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) engine=myisam;
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INSERT INTO t1 select * from t0;
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# Try a few basic selects to see that r_rows and r_filtered columns work
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analyze select * from t1;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00
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analyze select * from t1 where a<5;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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analyze select * from t1 where a>100;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 0.00 Using where
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# ANALYZE DELETE will delete rows:
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analyze delete from t1 where a in (2,3,4);
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 30.00 Using where
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select * from t1;
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a
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0
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1
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5
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6
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7
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8
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9
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drop table t1;
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# ANALYZE UPDATE will make updates:
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create table t1(a int, b int);
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insert into t1 select a,a from t0;
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analyze update t1 set b=100+b where a in (6,7,8);
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 30.00 Using where
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select * from t1;
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a b
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0 0
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1 1
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2 2
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3 3
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4 4
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5 5
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6 106
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7 107
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8 108
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9 9
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drop table t1;
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# Check that UNION works
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create table t1(a int, b int);
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insert into t1 select a,a from t0;
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analyze (select * from t1 A where a<5) union (select * from t1 B where a in (5,6));
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 PRIMARY A ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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2 UNION B ALL NULL NULL NULL NULL 10 10.00 100.00 20.00 Using where
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL 7.00 NULL NULL
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analyze (select * from t1 A where a<5) union (select * from t1 B where a in (1,2));
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 PRIMARY A ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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2 UNION B ALL NULL NULL NULL NULL 10 10.00 100.00 20.00 Using where
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL 5.00 NULL NULL
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drop table t1;
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drop table t0;
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#
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# Try a subquery.
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#
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create table t0 (a int, b int);
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insert into t0 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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create table t1 (a int, b int);
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insert into t1 values (1,1),(2,2),(3,3);
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# See .test file for the right values of r_rows and r_filtered.
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analyze select a, a in (select t0.b from t0 where t0.b+1=t1.b+1) from t1;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 3.00 100.00 100.00
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2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 10 3.00 100.00 33.33 Using where
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# Try a subquery that is never executed
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analyze select a, a in (select t0.b from t0 where t0.b+1=t1.b+1) from t1 where t1.a > 5;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 3.00 100.00 0.00 Using where
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2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 10 NULL 100.00 NULL Using where
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drop table t0, t1;
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#
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# Tests for join buffering
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#
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create table t0 (a int, b int);
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insert into t0 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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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, t1 where t0.a<5 and t1.a<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 NULL NULL NULL NULL 10 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
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# These should have filtered=50
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analyze select * from t0, t1 where t0.a<5 and t1.a<5;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where; Using join buffer (flat, BNL join)
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explain select * from t0, t1 where t0.a<5 and t1.b=t0.b;
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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 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
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# Now, t1 should have filtered=10
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analyze select * from t0, t1 where t0.a<5 and t1.b=t0.b;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 10.00 Using where; Using join buffer (flat, BNL join)
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explain select * from t0, t1 where t0.a<5 and t1.a<5 and t1.b=t0.b;
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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 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
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# Now, t1 should have filtered=10
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analyze select * from t0, t1 where t0.a<5 and t1.a<5 and t1.b=t0.b;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 50.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 10.00 Using where; Using join buffer (flat, BNL join)
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# TODO: Check what is counted for "range checked for each record".
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#
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# Test for joins
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#
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create table t2 (key1 int, key2x int, col1 int, key(key1), key(key2x));
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insert into t2 select A.a + 10 *B.a +100 * C.a,
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(A.a + 10 *B.a +100 * C.a)*2,
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A.a + 10 *B.a +100 * C.a
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from t0 A, t0 B, t0 C;
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# This always has matches, filtered=100%.
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analyze select * from t1,t2 where t2.key1=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
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1 SIMPLE t2 ref key1 key1 5 test.t1.a 1 1.00 100.00 100.00
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# This shows r_rows=0. It is actually 0.5 (should r_rows be changed to double?)
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analyze select * from t1,t2 where t2.key2x=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
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1 SIMPLE t2 ref key2x key2x 5 test.t1.a 1 0.50 100.00 100.00
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select * from t1,t2 where t2.key2x=t1.a;
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a b key1 key2x col1
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0 0 0 0 0
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2 2 1 2 1
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4 4 2 4 2
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6 6 3 6 3
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8 8 4 8 4
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# This has t2.filtered=40% (there are 5 values: {0,1,2,3,4}. two of them have mod=0)
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analyze select * from t1,t2 where t2.key2x=t1.a and mod(t2.col1,4)=0;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
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1 SIMPLE t2 ref key2x key2x 5 test.t1.a 1 0.50 100.00 40.00 Using where
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drop table t0,t1,t2;
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#
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# Check non-merged derived tables
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#
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create table t0 (a int, b int);
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insert into t0 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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update t0 set b=b/3;
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analyze select * from (select count(*),max(a),b from t0 group by b) T;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 10 4.00 100.00 100.00
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2 DERIVED t0 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using temporary; Using filesort
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drop table t0;
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#
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# Check ORDER/GROUP BY
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#
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create table t0 (a int, b int);
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insert into t0 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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analyze select count(*),max(a),b from t0 where a<7 group by b;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 70.00 Using where; Using temporary; Using filesort
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drop table t0;
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#
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# Check multi-table UPDATE/DELETE.
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#
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create table t0 (a int, b int);
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create table t1 (a int, b int);
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insert into t0 values (0,0),(2,2),(4,4), (8,8);
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insert into t1 values (0,0),(2,2), (6,6);
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analyze select * from t0,t1 where t0.a=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 3.00 100.00 100.00
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1 SIMPLE t0 ALL NULL NULL NULL NULL 4 4.00 100.00 16.67 Using where; Using join buffer (flat, BNL join)
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analyze update t0,t1 set t1.b=5555 where t0.a=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 3.00 100.00 100.00
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1 SIMPLE t0 ALL NULL NULL NULL NULL 4 4.00 100.00 16.67 Using where
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select * from t1;
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a b
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0 5555
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2 5555
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6 6
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analyze delete t1 from t1, t0 where t0.a=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 3.00 100.00 100.00
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1 SIMPLE t0 ALL NULL NULL NULL NULL 4 4.00 100.00 16.67 Using where
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select * from t1;
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a b
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6 6
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drop table t0, t1;
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#
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# MDEV-6393: ANALYZE SELECT crashes in Explain_query::print_explain with a non-existing column
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#
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create table t1 (i int);
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insert into t1 values (1),(2);
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analyze select a from t1;
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ERROR 42S22: Unknown column 'a' in 'field list'
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analyze delete from t1 where a=2;
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ERROR 42S22: Unknown column 'a' in 'where clause'
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analyze update t1 set a=2;
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ERROR 42S22: Unknown column 'a' in 'field list'
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create table t2 like t1;
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insert into t2 select * from t1;
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analyze update t2,t1 set t2.i=5 where t2.a=t1.a;
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ERROR 42S22: Unknown column 't2.a' in 'where clause'
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analyze delete t1 from t2,t1 where t2.a=t1.a;
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ERROR 42S22: Unknown column 't2.a' in 'where clause'
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drop table t1, t2;
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#
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# MDEV-6395: ANALYZE UPDATE/DELETE with impossible where does not produce any output
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#
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create table t1 (a int, b int, key(a));
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insert into t1 values (1,1),(2,2),(3,3),(4,4),(5,5);
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analyze delete from t1 where 1 > 2;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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analyze delete from t1 where a > 30 and a < 10;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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analyze update t1 set b=12345 where 1 > 2;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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analyze update t1 set b=12345 where a > 30 and a < 10;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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drop table t1;
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#
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# MDEV-6398: ANALYZE UPDATE does not populate r_rows
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#
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create table t1 (i int);
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insert into t1 values (1),(2),(3),(4);
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analyze update t1 set i=8;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 4.00 100.00 100.00
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drop table t1;
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#
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# Check ANALYZE SELECT INTO
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#
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create table t1 (i int);
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insert into t1 values (1);
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analyze select * into @var from t1 ;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1 NULL 100.00 NULL
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drop table t1;
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#
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# MDEV-6394: ANALYZE DELETE .. RETURNING fails with ERROR 2027 Malformed packet
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#
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create table t1 (i int);
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analyze delete from t1 returning *;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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drop table t1;
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#
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# MDEV-6396: ANALYZE INSERT/REPLACE is accepted, but does not produce a plan
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#
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create table t1 (a int primary key, b int);
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analyze insert into t1 values (1,1);
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 INSERT t1 ALL NULL NULL NULL NULL NULL NULL 100.00 100.00 NULL
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select * from t1;
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a b
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1 1
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analyze replace t1 values (1,2);
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 INSERT t1 ALL NULL NULL NULL NULL NULL NULL 100.00 100.00 NULL
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select * from t1;
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a b
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1 2
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drop table t1;
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#
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# MDEV-6400 "ANALYZE SELECT ... INTO @var" doesn't set @var
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#
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create table t1(a int);
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insert into t1 values (1),(2);
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analyze select a into @var from t1 where a <2 ;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 2.00 100.00 50.00 Using where
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analyze select a into @var from t1 ;
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ERROR 42000: Result consisted of more than one row
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analyze insert into t1 select * from t1;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 2.00 100.00 100.00 Using temporary
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analyze select * into outfile '../../tmp/data1.tmp' from t1;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 4.00 100.00 100.00
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drop table t1;
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#
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# MDEV-7024: Assertion `! is_set()' failed in
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# Diagnostics_area::set_eof_status on executing ANALYZE SELECT via PS
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#
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create table t1(a int);
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prepare stmt from "analyze select * from t1";
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execute stmt;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
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drop table t1;
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#
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# MDEV-7674: ANALYZE shows r_rows=0
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#
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create table t1(a int);
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insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t2 (a int, key(a));
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insert into t2 values (0),(1);
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analyze select * from t1 straight_join t2 force index(a) where t2.a=t1.a;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
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1 SIMPLE t2 ref a a 5 test.t1.a 1 0.20 100.00 100.00 Using index
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drop table t1,t2;
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#
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# MDEV-8063: Unconditional ANALYZE DELETE does not delete rows
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#
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create table t1 (i int);
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insert into t1 values (1),(2);
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analyze delete from t1;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL 2 NULL NULL NULL Deleting all rows
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select * from t1;
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i
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insert into t1 values (1),(2);
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explain delete from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL 2 Deleting all rows
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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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drop table t1;
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