From cde380ea508dd14efdc14c1b8f5587dad222b133 Mon Sep 17 00:00:00 2001 From: "gkodinov/kgeorge@magare.gmz" <> Date: Thu, 27 Mar 2008 19:39:21 +0200 Subject: [PATCH] Bug #35206: select query result different if the key is indexed or not The code for executing indexed ORDER BY was not setting all the internal fields correctly when selecting to execute ORDER BY over and index. Fixed by change the access method to one that will use the quick indexed access if one is selected while selecting indexed ORDER BY. --- mysql-test/r/order_by.result | 30 +++ mysql-test/t/order_by.test | 462 +++++++++++++++++++++++++++++++++++ sql/sql_select.cc | 17 ++ 3 files changed, 509 insertions(+) diff --git a/mysql-test/r/order_by.result b/mysql-test/r/order_by.result index 4320a7764de..faab8e49880 100644 --- a/mysql-test/r/order_by.result +++ b/mysql-test/r/order_by.result @@ -1428,3 +1428,33 @@ set session max_sort_length= 2180; select * from t1 order by b; ERROR HY001: Out of sort memory; increase server sort buffer size drop table t1; +CREATE TABLE t2 (a varchar(32), b int(11), c float, d double, +UNIQUE KEY a (a,b,c), KEY b (b), KEY c (c)); +CREATE TABLE t1 (a varchar(32), b char(3), UNIQUE KEY a (a,b), KEY b (b)); +CREATE TABLE t3 (a varchar(32), b char(3), UNIQUE KEY a (a,b)); +INSERT INTO t3 SELECT * FROM t1; +EXPLAIN +SELECT d FROM t1, t2 +WHERE t2.b=14 AND t2.a=t1.a AND 5.1limit= select_limit; } } + else if (tab->type != JT_ALL) + { + /* + We're about to use a quick access to the table. + We need to change the access method so as the quick access + method is actually used. + */ + DBUG_ASSERT(tab->select->quick); + tab->type=JT_ALL; + tab->use_quick=1; + tab->ref.key= -1; + tab->ref.key_parts=0; // Don't use ref key. + tab->read_first_record= join_init_read_record; + /* + TODO: update the number of records in join->best_positions[tablenr] + */ + } } used_key_parts= best_key_parts; order_direction= best_key_direction;