fix typo tab
@@ -11,13 +11,13 @@ a
a
NULL
==ifnull_non_nullable_columns==
-0\t0\t0
-0\t1\t0
-1\t0\t1
-1\t1\t1
+0 0 0
+0 1 0
+1 0 1
+1 1 1
==ifnull_nullable_columns==
-0\tNULL\t0
-1\tNULL\t1
-NULL\t0\t0
-NULL\t1\t1
-NULL\tNULL\tNULL
+0 NULL 0
+1 NULL 1
+NULL 0 0
+NULL 1 1
+NULL NULL NULL
