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| author | unknown <monty@narttu.mysql.fi> | 2003-05-27 18:40:37 +0300 |
|---|---|---|
| committer | unknown <monty@narttu.mysql.fi> | 2003-05-27 18:40:37 +0300 |
| commit | ef6d3a806085efdc138e6e894a832e4330692e64 (patch) | |
| tree | bc5052caf5ad47985df6d6862e6380f64e895fb2 /mysql-test/r/order_by.result | |
| parent | 1540912eca3b2daee03d78e85b39b3d19c192f15 (diff) | |
| download | mariadb-git-ef6d3a806085efdc138e6e894a832e4330692e64.tar.gz | |
ORDER BY optimization
Fixed new bug when reading field types
client/mysql.cc:
Fixed output for -T
libmysql/libmysql.c:
Filled missing fields in new MYSQL_FIELD structure
Fixed new bug when reading field types
mysql-test/r/order_by.result:
Result after new order by optimization
sql/opt_range.cc:
New ORDER BY optimization
sql/opt_range.h:
New ORDER BY optimization
sql/set_var.cc:
Speed optimization
sql/sql_select.cc:
New ORDER BY optimization
This alllows MySQL to change a ref/range index from (a,b) to (a,c) when 'b' was not used to find rows and one did
ORDER BY a,c or ORDER BY c
Diffstat (limited to 'mysql-test/r/order_by.result')
| -rw-r--r-- | mysql-test/r/order_by.result | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mysql-test/r/order_by.result b/mysql-test/r/order_by.result index 08176aeb2f8..3524b38e659 100644 --- a/mysql-test/r/order_by.result +++ b/mysql-test/r/order_by.result @@ -557,7 +557,7 @@ KEY StringField (FieldKey,StringVal(32)) INSERT INTO t1 VALUES ('0',3,'0'),('0',2,'1'),('0',1,'2'),('1',2,'1'),('1',1,'3'), ('1',0,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('3',2,'1'),('3',1,'2'),('3','3','3'); EXPLAIN SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal; id select_type table type possible_keys key key_len ref rows Extra -1 SIMPLE t1 ref FieldKey,LongField,StringField StringField 36 const 3 Using where; Using filesort +1 SIMPLE t1 ref FieldKey,LongField,StringField LongField 36 const 3 Using where SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal; FieldKey LongVal StringVal 1 0 2 |