database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-07 00:04:31 +03:00
Code Activity

Merge

Browse Source
This commit is contained in:
Sergey Petrunya
2014-10-21 00:02:24 +04:00
parent 81194d9203 1a996bde1e
commit 135bf1fcfb
3 changed files with 29 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
mysql-test/r/derived_opt.result
View File

@@ -376,7 +376,7 @@ where
D1.a= t1.a; D1.a= t1.a;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 10 Using where 1 PRIMARY t1 ALL NULL NULL NULL NULL 10 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t1.a 10 1 PRIMARY <derived2> hash_ALL key0 #hash#key0 5 test.t1.a 100 Using join buffer (flat, BNLH join)
2 DERIVED t2 ALL NULL NULL NULL NULL 100 Using filesort 2 DERIVED t2 ALL NULL NULL NULL NULL 100 Using filesort
set join_cache_level=@tmp_jcl; set join_cache_level=@tmp_jcl;
set optimizer_switch=@tmp_os; set optimizer_switch=@tmp_os;

28
sql/sql_select.cc
View File

@@ -10549,6 +10549,19 @@ uint check_join_cache_usage(JOIN_TAB *tab,
cache_level--; cache_level--;
} }
/*
Don't use BKA for materialized tables. We could actually have a
meaningful use of BKA when linked join buffers are used.
The problem is, the temp.table is not filled (actually not even opened
properly) yet, and this doesn't let us call
handler->multi_range_read_info(). It is possible to come up with
estimates, etc. without acessing the table, but it seems not to worth the
effort now.
*/
if (tab->table->pos_in_table_list->is_materialized_derived())
no_bka_cache= true;
/* /*
Don't use join buffering if we're dictated not to by no_jbuf_after Don't use join buffering if we're dictated not to by no_jbuf_after
(This is not meaningfully used currently) (This is not meaningfully used currently)
@@ -10615,20 +10628,7 @@ uint check_join_cache_usage(JOIN_TAB *tab,
if (tab->ref.is_access_triggered()) if (tab->ref.is_access_triggered())
goto no_join_cache; goto no_join_cache;
/* if (!tab->is_ref_for_hash_join() && !no_bka_cache)
Don't use BKA for materialized tables. We could actually have a
meaningful use of BKA when linked join buffers are used.
The problem is, the temp.table is not filled (actually not even opened
properly) yet, and this doesn't let us call
handler->multi_range_read_info(). It is possible to come up with
estimates, etc. without acessing the table, but it seems not to worth the
effort now.
*/
if (tab->table->pos_in_table_list->is_materialized_derived())
goto no_join_cache;
if (!tab->is_ref_for_hash_join())
{ {
flags= HA_MRR_NO_NULL_ENDPOINTS | HA_MRR_SINGLE_POINT; flags= HA_MRR_NO_NULL_ENDPOINTS | HA_MRR_SINGLE_POINT;
if (tab->table->covering_keys.is_set(tab->ref.key)) if (tab->table->covering_keys.is_set(tab->ref.key))