diff --git a/mysql-test/r/func_in.result b/mysql-test/r/func_in.result index e38e2624e19..a172d04d880 100644 --- a/mysql-test/r/func_in.result +++ b/mysql-test/r/func_in.result @@ -202,6 +202,14 @@ select count(*) from t1 where id not in (1,2); count(*) 1 drop table t1; +DROP TABLE IF EXISTS t1; +CREATE TABLE t1 SELECT 1 IN (2, NULL); +SELECT should return NULL. +SELECT * FROM t1; +1 IN (2, NULL) +NULL +DROP TABLE t1; +End of 4.1 tests CREATE TABLE t1 (a int PRIMARY KEY); INSERT INTO t1 VALUES (44), (45), (46); SELECT * FROM t1 WHERE a IN (45); @@ -343,3 +351,4 @@ some_id 1 2 drop table t1; +End of 5.0 tests diff --git a/mysql-test/t/func_in.test b/mysql-test/t/func_in.test index 8ddf1fbe314..d48606ac6e6 100644 --- a/mysql-test/t/func_in.test +++ b/mysql-test/t/func_in.test @@ -109,7 +109,28 @@ select count(*) from t1 where id not in (1); select count(*) from t1 where id not in (1,2); drop table t1; -# End of 4.1 tests + +# +# BUG#17047: CHAR() and IN() can return NULL without signaling NULL +# result +# +# The problem was in the IN() function that ignored maybe_null flags +# of all arguments except the first (the one _before_ the IN +# keyword, '1' in the test case below). +# +--disable_warnings +DROP TABLE IF EXISTS t1; +--enable_warnings + +CREATE TABLE t1 SELECT 1 IN (2, NULL); +--echo SELECT should return NULL. +SELECT * FROM t1; + +DROP TABLE t1; + + +--echo End of 4.1 tests + # # Bug #11885: WHERE condition with NOT IN (one element) @@ -232,3 +253,6 @@ select some_id from t1 where some_id not in(2,-1); select some_id from t1 where some_id not in(-4,-1,-4); select some_id from t1 where some_id not in(-4,-1,3423534,2342342); drop table t1; + + +--echo End of 5.0 tests diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc index 9a400d60ae6..70a8622af85 100644 --- a/sql/item_cmpfunc.cc +++ b/sql/item_cmpfunc.cc @@ -2465,7 +2465,6 @@ void Item_func_in::fix_length_and_dec() if (cmp_type == STRING_RESULT) in_item->cmp_charset= cmp_collation.collation; } - maybe_null= args[0]->maybe_null; max_length= 1; }