diff options
Diffstat (limited to 'mysql-test')
| -rw-r--r-- | mysql-test/r/func_if.result | 27 | ||||
| -rw-r--r-- | mysql-test/t/func_if.test | 27 |
2 files changed, 54 insertions, 0 deletions
diff --git a/mysql-test/r/func_if.result b/mysql-test/r/func_if.result index 508a50caf02..dd8f34d53d2 100644 --- a/mysql-test/r/func_if.result +++ b/mysql-test/r/func_if.result @@ -86,3 +86,30 @@ drop table t1; SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL; NULLIF(5,5) IS NULL NULLIF(5,5) IS NOT NULL 1 0 +DROP TABLE IF EXISTS t1; +CREATE TABLE t1 (a CHAR(10)); +INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb'); +SELECT a, NULLIF(a,'') FROM t1; +a NULLIF(a,'') +aaa aaa +NULL NULL + NULL +bbb bbb +SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL; +a NULLIF(a,'') +NULL NULL + NULL +DROP TABLE t1; +CREATE TABLE t1 (a CHAR(10)); +INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb'); +SELECT a, NULLIF(a,'') FROM t1; +a NULLIF(a,'') +aaa aaa +NULL NULL + NULL +bbb bbb +SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL; +a NULLIF(a,'') +NULL NULL + NULL +DROP TABLE t1; diff --git a/mysql-test/t/func_if.test b/mysql-test/t/func_if.test index 693773b18c8..ae820fae93b 100644 --- a/mysql-test/t/func_if.test +++ b/mysql-test/t/func_if.test @@ -60,3 +60,30 @@ drop table t1; # Bug #5595 NULLIF() IS NULL returns false if NULLIF() returns NULL # SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL; +# +# Test to check evaluation of MULLIF when the first argument is NULL +# (motivated by the Bug 11142) +# + +--disable_warnings +DROP TABLE IF EXISTS t1; +--enable_warnings + +CREATE TABLE t1 (a CHAR(10)); +INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb'); +SELECT a, NULLIF(a,'') FROM t1; +SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL; + +DROP TABLE t1; + +# +# Test for bug #11142: evaluation of NULLIF when the first argument is NULL +# + +CREATE TABLE t1 (a CHAR(10)); +INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb'); + +SELECT a, NULLIF(a,'') FROM t1; +SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL; + +DROP TABLE t1; |