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Cassandra storage engine: BKA support

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- We use HA_MRR_NO_ASSOC ("optimizer_switch=join_cache_hashed") mode
- Not able to use BKA's buffers yet.
- There is a variable to control batch size
- There are status counters.
- Nedeed to make some fixes in BKA code (to be checked with Igor)
This commit is contained in:
Sergey Petrunya
2012-08-27 08:44:58 +04:00
parent fdab0300c1
commit 8eb16159e1
7 changed files with 365 additions and 14 deletions
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5
sql/sql_join_cache.cc
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@ -3876,8 +3876,11 @@ int JOIN_TAB_SCAN_MRR::next()
If a record in in an incremental cache contains no fields then the
association for the last record in cache will be equal to cache->end_pos
*/
/*
psergey: this makes no sense where HA_MRR_NO_ASSOC is used.
DBUG_ASSERT(cache->buff <= (uchar *) (*ptr) &&
(uchar *) (*ptr) <= cache->end_pos);
*/
if (join_tab->table->vfield)
update_virtual_fields(join->thd, join_tab->table);
}
@ -4543,7 +4546,7 @@ bool JOIN_CACHE_BKAH::prepare_look_for_matches(bool skip_last)
{
last_matching_rec_ref_ptr= next_matching_rec_ref_ptr= 0;
if (no_association &&
(curr_matching_chain= get_matching_chain_by_join_key()))
!(curr_matching_chain= get_matching_chain_by_join_key())) //psergey: added '!'
return 1;
last_matching_rec_ref_ptr= get_next_rec_ref(curr_matching_chain);
return 0;