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MWL#90: subquery optimizations

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- Remove redundant changes againist 5.3-main
This commit is contained in:
Sergey Petrunya
2011-02-18 14:17:28 +03:00
parent 9482a2cf09
commit f93b0bbebb
7 changed files with 16 additions and 48 deletions
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33
sql/sql_join_cache.cc
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@ -1061,7 +1061,6 @@ int JOIN_CACHE::realloc_buffer()
*/
int JOIN_CACHE::init()
//psergey-merge:wtf is this here: for (tab= start_tab; tab != join_tab; tab= next_linear_tab(join, tab, TRUE))
{
DBUG_ENTER("JOIN_CACHE::init");
@ -3260,23 +3259,7 @@ uint JOIN_CACHE_HASHED::get_next_key(uchar ** key)
int JOIN_TAB_SCAN::open()
{
//psergey-merge: todo: check the below:
//JOIN_TAB *bound= join_tab-cache->tables;
#if 0
JOIN_TAB *bound= cache->start_tab;
// psergey-todo-merge: can we really iterate backwards?
// Q: is there really a need to iterate backwards?
for (JOIN_TAB *tab= join_tab-1; tab != bound && !tab->cache; tab--)
{
tab->status= tab->table->status;
tab->table->status= 0;
}
#endif
save_or_restore_used_tabs(join_tab, FALSE);
is_first_record= TRUE;
return join_init_read_record(join_tab);
}
@ -3381,12 +3364,7 @@ void save_or_restore_used_tabs(JOIN_TAB *join_tab, bool save)
void JOIN_TAB_SCAN::close()
{
#if 0
JOIN_TAB *bound= join_tab - cache->tables;
for (JOIN_TAB *tab= join_tab-1; tab != bound && !tab->cache; tab--)
tab->table->status= tab->status;
#endif
save_or_restore_used_tabs(join_tab, TRUE);
save_or_restore_used_tabs(join_tab, TRUE);
}
@ -3786,15 +3764,6 @@ int JOIN_TAB_SCAN_MRR::open()
/* Dynamic range access is never used with BKA */
DBUG_ASSERT(join_tab->use_quick != 2);
/*
psergey-merge: done?
JOIN_TAB *bound= join_tab - cache->tables;
for (JOIN_TAB *tab= join_tab-1; tab != bound && !tab->cache; tab--)
{
tab->status= tab->table->status;
tab->table->status= 0;
}
*/
save_or_restore_used_tabs(join_tab, FALSE);
init_mrr_buff();