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02e38e2ece
Improve performance of queries like
SELECT * FROM t1 WHERE field = NAME_CONST('a', 4);
by, in this example, replacing the WHERE clause with field = 4
in the case of ref access.
The rewrite is done during fix_fields and we disambiguate this
case from other cases of NAME_CONST by inspecting where we are
in parsing. We rely on THD::where to accomplish this. To
improve performance there, we change the type of THD::where to
be an enumeration, so we can avoid string comparisons during
Item_name_const::fix_fields. Consequently, this patch also
changes all usages of THD::where to conform likewise.
176 lines
6.1 KiB
Text
176 lines
6.1 KiB
Text
DROP TABLE IF EXISTS t1,t2,t3;
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CREATE TABLE t1 (
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a INT AUTO_INCREMENT PRIMARY KEY,
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message CHAR(20),
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FULLTEXT(message)
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) comment = 'original testcase by sroussey@network54.com';
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INSERT INTO t1 (message) VALUES ("Testing"),("table"),("testbug"),
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("steve"),("is"),("cool"),("steve is cool");
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SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) FROM t1 WHERE MATCH (message) AGAINST ('steve');
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a FORMAT(MATCH (message) AGAINST ('steve'),6)
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4 0.905873
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7 0.895690
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SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE MATCH (message) AGAINST ('steve');
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a MATCH (message) AGAINST ('steve' IN BOOLEAN MODE)
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4 1
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7 1
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SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) FROM t1 WHERE MATCH (message) AGAINST ('steve' IN BOOLEAN MODE);
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a FORMAT(MATCH (message) AGAINST ('steve'),6)
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4 0.905873
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7 0.895690
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SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE MATCH (message) AGAINST ('steve' IN BOOLEAN MODE);
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a MATCH (message) AGAINST ('steve' IN BOOLEAN MODE)
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4 1
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7 1
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SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY a;
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a FORMAT(MATCH (message) AGAINST ('steve'),6)
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4 0.905873
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7 0.895690
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SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) ORDER BY a;
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a MATCH (message) AGAINST ('steve' IN BOOLEAN MODE)
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4 1
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7 1
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SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) FROM t1 WHERE a in (2,7,4) and MATCH (message) AGAINST ('steve') ORDER BY a DESC;
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a FORMAT(MATCH (message) AGAINST ('steve'),6)
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7 0.895690
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4 0.905873
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SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE a in (2,7,4) and MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) ORDER BY a DESC;
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a MATCH (message) AGAINST ('steve' IN BOOLEAN MODE)
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7 1
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4 1
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SELECT a, FORMAT(MATCH (message) AGAINST ('steve'),6) FROM t1 WHERE a=7 and MATCH (message) AGAINST ('steve') ORDER BY 1;
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a FORMAT(MATCH (message) AGAINST ('steve'),6)
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7 0.895690
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SELECT a, MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) FROM t1 WHERE a=7 and MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) ORDER BY 1;
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a MATCH (message) AGAINST ('steve' IN BOOLEAN MODE)
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7 1
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SELECT IF(a=7,'steve-is-cool',IF(a=4,'cool', 'other')), FORMAT(MATCH (message) AGAINST ('steve'),6) as rel FROM t1 ORDER BY rel;
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IF(a=7,'steve-is-cool',IF(a=4,'cool', 'other')) rel
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other 0.000000
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other 0.000000
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other 0.000000
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other 0.000000
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other 0.000000
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steve-is-cool 0.895690
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cool 0.905873
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SELECT IF(a=7,'match',IF(a=4,'match', 'no-match')), MATCH (message) AGAINST ('steve' IN BOOLEAN MODE) as rel FROM t1 ORDER BY rel;
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IF(a=7,'match',IF(a=4,'match', 'no-match')) rel
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no-match 0
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no-match 0
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no-match 0
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no-match 0
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no-match 0
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match 1
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match 1
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alter table t1 add key m (message);
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explain SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 fulltext message message 0 1 Using where; Using filesort
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SELECT message FROM t1 WHERE MATCH (message) AGAINST ('steve') ORDER BY message desc;
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message
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steve is cool
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steve
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drop table t1;
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CREATE TABLE t1 (
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a INT AUTO_INCREMENT PRIMARY KEY,
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message CHAR(20),
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FULLTEXT(message)
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);
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INSERT INTO t1 (message) VALUES ("testbug"),("testbug foobar");
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SELECT a, MATCH (message) AGAINST ('t* f*' IN BOOLEAN MODE) as rel FROM t1;
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a rel
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1 1
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2 2
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SELECT a, MATCH (message) AGAINST ('t* f*' IN BOOLEAN MODE) as rel FROM t1 ORDER BY rel,a;
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a rel
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1 1
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2 2
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drop table t1;
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CREATE TABLE t1 (
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id int(11) NOT NULL auto_increment,
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thread int(11) NOT NULL default '0',
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beitrag longtext NOT NULL,
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PRIMARY KEY (id),
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KEY thread (thread),
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FULLTEXT KEY beitrag (beitrag)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=7923 ;
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CREATE TABLE t2 (
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id int(11) NOT NULL auto_increment,
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text varchar(100) NOT NULL default '',
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PRIMARY KEY (id),
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KEY text (text)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=63 ;
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CREATE TABLE t3 (
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id int(11) NOT NULL auto_increment,
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forum int(11) NOT NULL default '0',
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betreff varchar(70) NOT NULL default '',
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PRIMARY KEY (id),
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KEY forum (forum),
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FULLTEXT KEY betreff (betreff)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=996 ;
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(b.betreff) against ('+abc' in boolean mode)
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group by a.text, b.id, b.betreff
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union
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(c.beitrag) against ('+abc' in boolean mode)
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group by
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a.text, b.id, b.betreff
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order by
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match(b.betreff) against ('+abc' in boolean mode) desc;
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ERROR 42000: Table 'b' from one of the SELECTs cannot be used in order clause
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(b.betreff) against ('+abc' in boolean mode)
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union
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(c.beitrag) against ('+abc' in boolean mode)
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order by
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match(b.betreff) against ('+abc' in boolean mode) desc;
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ERROR 42000: Table 'b' from one of the SELECTs cannot be used in order clause
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(b.betreff) against ('+abc' in boolean mode)
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union
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select a.text, b.id, b.betreff
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from
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t2 a inner join t3 b on a.id = b.forum inner join
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t1 c on b.id = c.thread
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where
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match(c.beitrag) against ('+abc' in boolean mode)
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order by
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match(betreff) against ('+abc' in boolean mode) desc;
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text id betreff
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(select b.id, b.betreff from t3 b) union
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(select b.id, b.betreff from t3 b)
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order by match(betreff) against ('+abc' in boolean mode) desc;
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id betreff
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(select b.id, b.betreff from t3 b) union
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(select b.id, b.betreff from t3 b)
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order by match(betreff) against ('+abc') desc;
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ERROR HY000: Can't find FULLTEXT index matching the column list
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select distinct b.id, b.betreff from t3 b
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order by match(betreff) against ('+abc' in boolean mode) desc;
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id betreff
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select b.id, b.betreff from t3 b group by b.id+1
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order by match(betreff) against ('+abc' in boolean mode) desc;
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id betreff
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drop table t1,t2,t3;
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