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658128af43
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
385 lines
11 KiB
Text
385 lines
11 KiB
Text
set @old_debug= @@debug_dbug;
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create table t_tmp(a int, b int);
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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insert into t1 values(1);
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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select a , invisible from t1;
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a invisible
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1 9
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insert into t1(a, invisible) values(99,99);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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insert into t1(invisible) values(99);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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insert into t_tmp select a, invisible from t1;
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insert into t1 select * from t_tmp;
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ERROR 21S01: Column count doesn't match value count at row 1
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insert into t1(a,invisible) select * from t_tmp;
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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1 9
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insert into t1 values (5), (invisible+1);
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select a , invisible from t1;
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a invisible
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1 9
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5 9
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10 9
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delete from t1 where a > 1;
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update t1 set a = invisible where a=1;
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select a , invisible from t1;
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a invisible
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9 9
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update t1 set a = (select invisible+100 from t1 limit 1) where a=(select a from t1 limit 1);
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select a , invisible from t1;
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a invisible
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109 9
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update t1 set invisible = 23 where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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update t1 set invisible = 101 where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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update t1 set invisible = (select invisible+100 from t1 limit 1) where a=(select invisible from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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set @a=12;
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update t1 set invisible = (select @a from dual) where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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update t1 set invisible = (select invisible+100 from t1 limit 1) where a=(select a from t1 limit 1);
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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select a , invisible from t1;
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a invisible
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109 9
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set @a=(select invisible from t1 limit 1);
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select @a from dual;
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@a
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9
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alter table t1 add constraint a check (invisible > 2);
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ERROR 42S22: Unknown column 'invisible' in 'CHECK'
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t2(a int, b int as (invisible +2) virtual);
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ERROR 42S22: Unknown column 'invisible' in 'GENERATED ALWAYS AS'
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create table t2(a int , b int);
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insert into t2 values(2,2);
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insert into t2 select a, invisible from t1;
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set debug_dbug=@old_debug;
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select * from t1;
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a
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109
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select invisible ,a from t1;
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invisible a
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9 109
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drop table t1,t2,t_tmp;
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set debug_dbug= "+d,test_completely_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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ERROR 42S22: Unknown column 'invisible' in 'field list'
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set debug_dbug= "+d,test_completely_invisible";
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select invisible ,a from t1;
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invisible a
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9 1
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set debug_dbug=@old_debug;
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create table t2 (invisible int);
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select * from t1 join t2 using (invisible);
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ERROR 42S22: Unknown column 'invisible' in 'from clause'
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select * from t2 join t1 using (invisible);
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ERROR 42S22: Unknown column 'invisible' in 'from clause'
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insert t2 values (8),(9);
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select * from t1 natural join t2;
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a invisible
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1 8
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1 9
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select * from t2 natural join t1;
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invisible a
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8 1
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9 1
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drop table t1, t2;
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set debug_dbug= "+d,test_pseudo_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 change invisible b int;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 modify invisible char;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 drop invisible;
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ERROR 42000: Can't DROP COLUMN `invisible`; check that it exists
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible int;
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ERROR 42S21: Duplicate column name 'invisible'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible2 int default 2;
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select * from t1;
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a invisible2
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1 2
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select invisible ,a from t1;
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invisible a
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9 1
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create trigger trg before insert on t1 for each row set new.invisible=1;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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create trigger trg before insert on t1 for each row set @a:=new.invisible;
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible";
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create table t1(a int);
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set debug_dbug=@old_debug;
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create trigger trg before insert on t1 for each row set new.invisible=1;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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create trigger trg before insert on t1 for each row set @a:=new.invisible;
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ERROR 42S22: Unknown column 'invisible' in 'NEW'
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set debug_dbug= "+d,test_completely_invisible";
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desc t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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insert into t1 values(1);
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 change invisible b int;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 modify invisible char;
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ERROR 42S22: Unknown column 'invisible' in 't1'
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 drop invisible;
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ERROR 42000: Can't DROP COLUMN `invisible`; check that it exists
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select * from t1;
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a
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1
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select invisible ,a from t1;
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invisible a
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9 1
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ALTER table t1 add invisible int;
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select * from t1;
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a invisible
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1 NULL
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select invisible1, invisible ,a from t1;
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invisible1 invisible a
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9 NULL 1
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ALTER table t1 add hid int default 2;
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select * from t1;
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a invisible hid
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1 NULL 2
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select invisible ,a from t1;
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invisible a
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NULL 1
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drop table t1;
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set debug_dbug=@old_debug;
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Create table t1( a int default(99) invisible, b int);
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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alter table t1 add index(a);
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alter table t1 add index(a,b);
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 a 1 a A NULL NULL NULL YES BTREE
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t1 1 a_2 1 a A NULL NULL NULL YES BTREE
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t1 1 a_2 2 b A NULL NULL NULL YES BTREE
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drop table t1;
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set debug_dbug= "+d,test_pseudo_invisible";
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Create table t1( a int default(99) invisible, b int);
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Create table t2( a int default(99) invisible, b int, unique(invisible));
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ERROR 42000: Key column 'invisible' doesn't exist in table
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set debug_dbug=@old_debug;
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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select invisible, a, b from t1 order by b;
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invisible a b
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9 99 1
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9 99 2
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9 99 3
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9 99 4
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alter table t1 add index(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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alter table t1 add index(b,invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible";
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Create table t1( a int default(99) invisible, b int);
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Create table t2( a int default(99) invisible, b int, unique(invisible));
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ERROR 42000: Key column 'invisible' doesn't exist in table
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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select * from t1 order by b;
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b
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1
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2
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3
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4
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select invisible, a, b from t1 order by b;
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invisible a b
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9 99 1
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9 99 2
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9 99 3
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9 99 4
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set debug_dbug=@old_debug;
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alter table t1 add index(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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alter table t1 add index(b,invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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drop table t1;
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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Create table t1( a int default(99) , b int,c int, index(b));
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set debug_dbug=@old_debug;
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Show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 b 1 b A NULL NULL NULL YES BTREE
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select * from INFORMATION_SCHEMA.STATISTICS where TABLE_SCHEMA ='test' and table_name='t1';
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TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT
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def test t1 1 test b 1 b A NULL NULL NULL YES BTREE
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT 99,
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`b` int(11) DEFAULT NULL,
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`c` int(11) DEFAULT NULL,
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KEY `b` (`b`)
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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insert into t1 values(1,1,1);
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insert into t1 values(2,2,2);
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insert into t1 values(3,3,3);
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insert into t1 values(4,4,4);
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insert into t1 values(5,5,5);
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insert into t1 values(6,6,6);
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insert into t1 values(7,7,7);
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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select invisible, a ,b from t1 order by b;
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invisible a b
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9 1 1
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9 2 2
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9 3 3
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9 4 4
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9 5 5
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9 6 6
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9 7 7
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL invisible NULL NULL NULL 7 Using where
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alter table t1 add x int default 3;
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select invisible, a ,b from t1;
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invisible a b
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9 1 1
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9 2 2
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9 3 3
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9 4 4
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9 5 5
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9 6 6
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9 7 7
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set debug_dbug=@old_debug;
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Show index from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 b 1 b A NULL NULL NULL YES BTREE
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create index a1 on t1(invisible);
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ERROR 42000: Key column 'invisible' doesn't exist in table
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set debug_dbug= "+d,test_completely_invisible,test_invisible_index";
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drop index invisible on t1;
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ERROR 42000: Can't DROP INDEX `invisible`; check that it exists
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL invisible NULL NULL NULL 7 Using where
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create index invisible on t1(c);
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explain select * from t1 where invisible =9;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL invisible_2 NULL NULL NULL 7 Using where
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show indexes in t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 b 1 b A NULL NULL NULL YES BTREE
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t1 1 invisible 1 c A NULL NULL NULL YES BTREE
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t1 1 invisible_2 1 invisible A NULL NULL NULL YES BTREE
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drop table t1;
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set @old_debug= @@debug_dbug;
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CREATE TABLE t1 (i INT );
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SET debug_dbug="+d,test_completely_invisible,test_invisible_index";
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CREATE TABLE t2 LIKE t1;
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SET debug_dbug= DEFAULT;
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DROP TABLE t1, t2;
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