From: Tor Didriksen
Date: January 27 2012 11:16am
Subject: bzr push into mysql-trunk branch (tor.didriksen:3532 to 3533) WL#5957
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 3533 Tor Didriksen	2012-01-27
      WL#5957 post-push fix: dont count_bits unless we are going to use them

    modified:
      sql/handler.cc
 3532 Guilhem Bichot	2012-01-26
      Final review comments for
      Bug#13596330 - EXTRA ROW ON SELECT WITH NESTED IN CLAUSE
      + IS NULL WHEN SEMIJOIN + BNL IS ON
     @ mysql-test/include/join_cache.inc
        make the test engine-agnostic (I verified that it would still
        fail without the code fix)

    modified:
      mysql-test/include/join_cache.inc
      mysql-test/r/join_cache_bka.result
      mysql-test/r/join_cache_bka_nixbnl.result
      mysql-test/r/join_cache_bkaunique.result
      mysql-test/r/join_cache_bnl.result
      mysql-test/r/join_cache_nojb.result
      sql/sql_join_buffer.cc
      sql/table.h
=== modified file 'sql/handler.cc'
--- a/sql/handler.cc	2012-01-26 13:09:59 +0000
+++ b/sql/handler.cc	2012-01-27 11:15:59 +0000
@@ -4604,12 +4604,13 @@ handler::multi_range_read_info_const(uin
            because the number of rows with this value are likely to be 
            very different than the values in the index statistics.
     */
-    const int keyparts_used= my_count_bits(range.start_key.keypart_map);
+    int keyparts_used= 0;
     if ((range.range_flag & UNIQUE_RANGE) &&                        // 1)
         !(range.range_flag & NULL_RANGE))
       rows= 1; /* there can be at most one row */
     else if ((range.range_flag & EQ_RANGE) &&                       // 2a)
              (range.range_flag & USE_INDEX_STATISTICS) &&           // 2b)
+             (keyparts_used= my_count_bits(range.start_key.keypart_map)) &&
              table->key_info[keyno].rec_per_key[keyparts_used-1] && // 2c)
              !(range.range_flag & NULL_RANGE))
       rows= table->key_info[keyno].rec_per_key[keyparts_used-1];

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