BUG#11766317: FIND_IN_SET won't work normaly after upgrade

              from 5.1 to 5.5

(Former 59405)

In this bug, args[0] in an Item_func_find_in_set stored an 
Item_func_weekday that was constant. In 
Item_func_find_in_set::fix_length_and_dec(), args[0]->val_str() 
was called. Later, when Item_func_find_in_set::val_int() was 
called, args[0]->null_value was checked. However, the 
Item_func_weekday in args[0] had now been replaced with an 
Item_cache. No val_*() calls had been made to this Item_cache,
thus null_value was incorrectly 'true', resulting in missing 
rows in the result set.

enum_value gets a value in fix_length_and_dec() iff args[0]
is both constant and non-null. It is therefore unnecessary 
to check the null_value of args[0] in val_int().

An alternative fix would be to call args[0]->val_int() inside 
Item_func_find_in_set::val_int(). This would ensure
args[0]->null_value was set correctly (always false in this case), 
but that would have to be done for every record this const value 
is checked against.


mysql-test/r/func_set.result:
  Add test for BUG#59405
mysql-test/t/func_set.test:
  Add test for BUG#59405

1 files changed, 22 insertions, 0 deletions

diff --git a/mysql-test/t/func_set.test b/mysql-test/t/func_set.test
index 294efa8caf1..3531864c860 100644
--- a/mysql-test/t/func_set.test
+++ b/mysql-test/t/func_set.test
@@ -97,3 +97,25 @@ SELECT CONVERT( a USING latin1 ) FROM t1;
 SELECT CONVERT( a USING latin1 ) FROM t2;
 
 DROP TABLE t1, t2;
+
+--echo #
+--echo # BUG#59405: FIND_IN_SET won't work normaly after upgrade from 5.1 to 5.5
+--echo #
+
+CREATE TABLE t1(days set('1','2','3','4','5','6','7'));
+INSERT INTO t1 VALUES('1,2,3,4,5,6,7'), (NULL), ('1,2,3,4,5,6,7');
+
+--echo
+SELECT * FROM t1 WHERE FIND_IN_SET(DAYOFWEEK(CURRENT_DATE()), days);
+SELECT * FROM t1 WHERE FIND_IN_SET(DAYOFWEEK(CURRENT_DATE()), days) IS UNKNOWN; 
+SELECT * FROM t1 WHERE FIND_IN_SET(DAYOFWEEK(CURRENT_DATE()), NULL);
+SELECT * FROM t1 WHERE FIND_IN_SET(DAYOFWEEK(CURRENT_DATE()), NULL) IS UNKNOWN; 
+SELECT * FROM t1 WHERE FIND_IN_SET(7, days);
+SELECT * FROM t1 WHERE FIND_IN_SET(8, days);
+SELECT * FROM t1 WHERE FIND_IN_SET(NULL, days); 
+SELECT * FROM t1 WHERE FIND_IN_SET(NULL, days) IS UNKNOWN; 
+SELECT * FROM t1 WHERE FIND_IN_SET(NULL, NULL); 
+SELECT * FROM t1 WHERE FIND_IN_SET(NULL, NULL) IS UNKNOWN; 
+
+--echo
+DROP TABLE t1;