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26a3d567c9
MDEV-5984: EITS: Incorrect filtered% value for single-table select with range access
- Fix calculate_cond_selectivity_for_table() to work correctly with range accesses
over multi-component keys:
= First, take selectivity of all possible range scans into account. Remember which
fields were used bt the range scans.
= Then, calculate selectivity produced by sargable predicates on fields. If a
field was used in a possible range access, assume its selectivity is already
taken into account.
- Fix table_cond_selectivity(): when quick select is used, selectivity of
COND(table) is taken into account in matching_candidates_in_table(). In
table_cond_selectivity() we should not apply it for the second time.
113 lines
3.8 KiB
Plaintext
113 lines
3.8 KiB
Plaintext
--source include/have_stat_tables.inc
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--echo #
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--echo # Engine-agnostic tests for statistics-based selectivity calculations.
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--echo # - selectivity tests that depend on the engine should go into
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--echo # t/selectivity.test. That test is run with myisam/innodb/xtradb.
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--echo # - this file is for tests that don't depend on the engine.
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--echo #
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--disable_warnings
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drop table if exists t0,t1,t2,t3;
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--enable_warnings
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select @@global.use_stat_tables;
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select @@session.use_stat_tables;
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set @save_use_stat_tables=@@use_stat_tables;
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set use_stat_tables='preferably';
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set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
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set @save_histogram_size=@@histogram_size;
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set @save_histogram_type=@@histogram_type;
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--echo #
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--echo # MDEV-5917: EITS: different order of predicates in IN (...) causes different estimates
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--echo #
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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 (col1 int);
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--echo # one value in 1..100 range
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insert into t2 select A.a + B.a*10 from t1 A, t1 B;
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--echo # ten values in 100...200 range
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insert into t2 select 100 + A.a + B.a*10 from t1 A, t1 B, t1 C;
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set histogram_type='SINGLE_PREC_HB';
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set histogram_size=100;
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set optimizer_use_condition_selectivity=4;
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analyze table t2 persistent for all;
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--echo # The following two must have the same in 'Extra' column:
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explain extended select * from t2 where col1 IN (20, 180);
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explain extended select * from t2 where col1 IN (180, 20);
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drop table t1, t2;
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--echo #
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--echo # MDEV-5926: EITS: Histogram estimates for column=least_possible_value are wrong
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--echo #
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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);
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insert into t1 select A.a from t0 A, t0 B, t0 C;
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set histogram_size=20;
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set histogram_type='single_prec_hb';
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analyze table t1 persistent for all;
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set use_stat_tables='preferably';
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set optimizer_use_condition_selectivity=4;
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--echo # Should select about 10%:
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explain extended select * from t1 where a=2;
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--echo # Should select about 10%:
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explain extended select * from t1 where a=1;
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--echo # Must not have filtered=100%:
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explain extended select * from t1 where a=0;
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--echo # Again, must not have filtered=100%:
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explain extended select * from t1 where a=-1;
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drop table t0, t1;
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--echo #
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--echo # MDEV-4362: Selectivity estimates for IN (...) do not depend on whether the values are in range
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--echo #
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create table t1 (col1 int);
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set @a=-1;
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create table t2 (a int) select (@a:=@a+1) as a from information_schema.session_variables A limit 100;
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insert into t1 select A.a from t2 A, t2 B where A.a < 100 and B.a < 100;
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select min(col1), max(col1), count(*) from t1;
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set histogram_size=100;
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analyze table t1 persistent for all;
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explain extended select * from t1 where col1 in (1,2,3);
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--echo # Must not cause fp division by zero, or produce nonsense numbers:
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explain extended select * from t1 where col1 in (-1,-2,-3);
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explain extended select * from t1 where col1<=-1;
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drop table t1, t2;
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--echo #
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--echo # MDEV-5984: EITS: Incorrect filtered% value for single-table select with range access
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--echo #
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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, b int, col1 varchar(64), col2 varchar(64), key(a,b));
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insert into t2 select A.a+10*B.a, C.a+10*D.a, 'filler-data1', 'filler-data2' from t1 A, t1 B, t1 C, t1 D;
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set histogram_size=100;
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set optimizer_use_condition_selectivity=4;
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set use_stat_tables='preferably';
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analyze table t2 persistent for all;
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--echo # This must show filtered=100%:
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explain extended select * from t2 where a in (1,2,3) and b in (1,2,3);
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drop table t2, t1;
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--echo #
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--echo # End of the test file
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--echo #
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set use_stat_tables= @save_use_stat_tables;
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set histogram_type=@save_histogram_type;
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set histogram_size=@save_histogram_size;
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set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
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