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Back-port from 6.0 of the fix for

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BUG#38049 "incorrect rows estimations with references from preceding table"
(from revid:sergefp@mysql.com-20090126194259-ue20il3qro529l4d).
Compared to 6.0 where EXPLAIN indicates "Using index condition", here in join_optimizer.result
we see "Using where"; it's normal; 6.0 shows the same if disabling Index Condition Pushdown.
This commit is contained in:
Guilhem Bichot
2009-10-19 15:14:43 +02:00
parent ed8aaec764
commit b1f6a8e72f
4 changed files with 86 additions and 3 deletions
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3
sql/sql_select.cc
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@ -4328,7 +4328,8 @@ best_access_path(JOIN *join,
in ReuseRangeEstimateForRef-3.
*/
if (table->quick_keys.is_set(key) &&
const_part & (1 << table->quick_key_parts[key]) &&
(const_part & ((1 << table->quick_key_parts[key])-1)) ==
((1 << table->quick_key_parts[key])-1) &&
table->quick_n_ranges[key] == 1 &&
records > (double) table->quick_rows[key])
{