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| author | Igor Babaev <igor@askmonty.org> | 2014-10-28 22:31:52 -0700 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2014-10-28 22:31:52 -0700 |
| commit | 100b10d8efbcbc936d742b87aacf49dab037333f (patch) | |
| tree | 33cd992dc65d7bd5d585f09169d1f14ac5929f53 /sql/sql_statistics.cc | |
| parent | 2d088e265ce3ca0523846ec97c7b3b2c4e6cba67 (diff) | |
| download | mariadb-git-100b10d8efbcbc936d742b87aacf49dab037333f.tar.gz | |
Fixed bug mdev-6843.
The function get_column_range_cardinality() returned a wrong result for any column
containing only null values.
Diffstat (limited to 'sql/sql_statistics.cc')
| -rw-r--r-- | sql/sql_statistics.cc | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sql/sql_statistics.cc b/sql/sql_statistics.cc index a38df24cfb7..9807a26f772 100644 --- a/sql/sql_statistics.cc +++ b/sql/sql_statistics.cc @@ -3502,7 +3502,12 @@ double get_column_range_cardinality(Field *field, !(range_flag & NEAR_MIN); if (col_non_nulls < 1) - res= 0; /* this is likely wrong, see MDEV-6843 */ + { + if (nulls_incl) + res= col_nulls; + else + res= 0; + } else if (min_endp && max_endp && min_endp->length == max_endp->length && !memcmp(min_endp->key, max_endp->key, min_endp->length)) { |