diff options
| -rw-r--r-- | mysql-test/r/func_compress.result | 7 | ||||
| -rw-r--r-- | mysql-test/t/func_compress.test | 9 | ||||
| -rw-r--r-- | sql/item_strfunc.cc | 1 |
3 files changed, 17 insertions, 0 deletions
diff --git a/mysql-test/r/func_compress.result b/mysql-test/r/func_compress.result index 9bc8e417e19..8d6fa9927ce 100644 --- a/mysql-test/r/func_compress.result +++ b/mysql-test/r/func_compress.result @@ -72,3 +72,10 @@ set @@max_allowed_packet=1048576*100; select compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null; compress(repeat('aaaaaaaaaa', IF(XXX, 10, 10000000))) is null 0 +create table t1(a blob); +insert into t1 values(NULL), (compress('a')); +select uncompress(a), uncompressed_length(a) from t1; +uncompress(a) uncompressed_length(a) +NULL NULL +a 1 +drop table t1; diff --git a/mysql-test/t/func_compress.test b/mysql-test/t/func_compress.test index 6b85062b9fa..0f3c3cab307 100644 --- a/mysql-test/t/func_compress.test +++ b/mysql-test/t/func_compress.test @@ -45,4 +45,13 @@ set @@max_allowed_packet=1048576*100; --replace_result "''" XXX "'1'" XXX eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null; +# +# Bug #18643: problem with null values +# + +create table t1(a blob); +insert into t1 values(NULL), (compress('a')); +select uncompress(a), uncompressed_length(a) from t1; +drop table t1; + # End of 4.1 tests diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc index 04765e18191..f0127ed2a5d 100644 --- a/sql/item_strfunc.cc +++ b/sql/item_strfunc.cc @@ -2850,6 +2850,7 @@ String *Item_func_uncompress::val_str(String *str) if (!res) goto err; + null_value= 0; if (res->is_empty()) return res; |