Bug #31887: DML Select statement not returning same results

when executed in version 5

Zero fill is a field attribute only. So we can't always 
propagate  constants for zerofill fields : the values and 
expression results don't have that flag.

Fixed by converting the const value to a string and 
using that in const propagation when the context allows it. 
Disable const propagation for fields with ZEROFILL flag in
all the other cases.


mysql-test/r/compare.result:
  Bug #31887: test case
mysql-test/t/compare.test:
  Bug #31887: test case
sql/item.cc:
  Bug #31887: If the context allows conversion
  of an int constant to a zero-filled string constant
  put the string constant instead of the int constant
  when doing const propagation
sql/mysql_priv.h:
  Bug #31887: a macro to get all the Field_num
  descendant fields.

1 files changed, 38 insertions, 0 deletions

diff --git a/mysql-test/r/compare.result b/mysql-test/r/compare.result
index c141b255716..c9ef41e0582 100644
--- a/mysql-test/r/compare.result
+++ b/mysql-test/r/compare.result
@@ -53,3 +53,41 @@ a	b
 Warnings:
 Warning	1292	Truncated incorrect DOUBLE value: '
'
 drop table if exists t1;
+CREATE TABLE  t1 (b int(2) zerofill, c int(2) zerofill);
+INSERT INTO t1 (b,c) VALUES (1,2), (1,1), (2,2);
+SELECT CONCAT(b,c), CONCAT(b,c) = '0101' FROM t1;
+CONCAT(b,c)	CONCAT(b,c) = '0101'
+0102	0
+0101	1
+0202	0
+EXPLAIN EXTENDED SELECT b,c FROM t1 WHERE b = 1 AND CONCAT(b,c) = '0101';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`b` = 1) and (concat(_binary'01',`test`.`t1`.`c`) = _latin1'0101'))
+SELECT b,c FROM t1 WHERE b = 1 AND CONCAT(b,c) = '0101';
+b	c
+01	01
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (1),(2);
+SELECT a, 
+(SELECT COUNT(*) FROM t1 
+WHERE b = t2.a AND CONCAT(b,c) = CONCAT('0',t2.a,'01')) x 
+FROM t2 ORDER BY a;
+a	x
+1	1
+2	0
+EXPLAIN EXTENDED 
+SELECT a, 
+(SELECT COUNT(*) FROM t1 
+WHERE b = t2.a AND CONCAT(b,c) = CONCAT('0',t2.a,'01')) x 
+FROM t2 ORDER BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using filesort
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+Warnings:
+Note	1276	Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t2`.`a` AS `a`,(select count(0) AS `COUNT(*)` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t2`.`a`) and (concat(`test`.`t1`.`b`,`test`.`t1`.`c`) = concat(_latin1'0',`test`.`t2`.`a`,_latin1'01')))) AS `x` from `test`.`t2` order by `test`.`t2`.`a`
+DROP TABLE t1,t2;
+End of 5.0 tests