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Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.1-opt

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into  rakia.gmz:/home/kgeorge/mysql/autopush/B16590-5.1-opt
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gkodinov/kgeorge@rakia.gmz
2007-01-22 12:58:14 +02:00
parent a5a43da10e 9ea140d13e
commit c9df1caac8
3 changed files with 38 additions and 0 deletions
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16
sql/sql_select.cc
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@ -7722,6 +7722,22 @@ static void update_const_equal_items(COND *cond, JOIN_TAB *tab)
key_map possible_keys= field->key_start;
possible_keys.intersect(field->table->keys_in_use_for_query);
stat[0].const_keys.merge(possible_keys);
/*
For each field in the multiple equality (for which we know that it
is a constant) we have to find its corresponding key part, and set
that key part in const_key_parts.
*/
if (!possible_keys.is_clear_all())
{
TABLE *tab= field->table;
KEYUSE *use;
for (use= stat->keyuse; use && use->table == tab; use++)
if (possible_keys.is_set(use->key) &&
tab->key_info[use->key].key_part[use->keypart].field ==
field)
tab->const_key_parts[use->key]|= use->keypart_map;
}
}
}
}