diff options
| author | bar@mysql.com <> | 2004-11-03 15:22:33 +0400 |
|---|---|---|
| committer | bar@mysql.com <> | 2004-11-03 15:22:33 +0400 |
| commit | 45451568bfabaaf42d5f55c05c57a716ceb42798 (patch) | |
| tree | c5bf40ee83d4e86e49280ff78cf080946ca52bee /sql/opt_range.cc | |
| parent | 4650f0acab425e08b5f3f7f7bee9612f81387b6e (diff) | |
| download | mariadb-git-45451568bfabaaf42d5f55c05c57a716ceb42798.tar.gz | |
opt_range.cc, range.result, range.test:
Bug #6045: Binary Comparison regression in MySQL 4.1
Binary searches didn't use a case insensitive index, now they do.
Diffstat (limited to 'sql/opt_range.cc')
| -rw-r--r-- | sql/opt_range.cc | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sql/opt_range.cc b/sql/opt_range.cc index 541acc69ec7..c9528af7d98 100644 --- a/sql/opt_range.cc +++ b/sql/opt_range.cc @@ -1013,13 +1013,22 @@ get_mm_leaf(PARAM *param, COND *conf_func, Field *field, KEY_PART *key_part, } /* - We can't use an index when comparing strings of - different collations + 1. Usually we can't use an index if the column collation + differ from the operation collation. + + 2. However, we can reuse a case insensitive index for + the binary searches: + + WHERE latin1_swedish_ci_column = 'a' COLLATE lati1_bin; + + WHERE latin1_swedish_ci_colimn = BINARY 'a ' + */ if (field->result_type() == STRING_RESULT && value->result_type() == STRING_RESULT && key_part->image_type == Field::itRAW && - ((Field_str*)field)->charset() != conf_func->compare_collation()) + ((Field_str*)field)->charset() != conf_func->compare_collation() && + !(conf_func->compare_collation()->state & MY_CS_BINSORT)) DBUG_RETURN(0); if (type == Item_func::LIKE_FUNC) |