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Fixed bug #18243.

Browse Source 
The implementation of the method Item_func_reverse::val_str
for the REVERSE function modified the argument of the function.
This led to wrong results for expressions that contained
REVERSE(ref) if ref occurred somewhere else in the expressions.


mysql-test/r/func_str.result:
  Added a test case for bug #18243.
mysql-test/t/func_str.test:
  Added a test case for bug #18243.
sql/item_strfunc.cc:
  Fixed bug #18243.
  The implementation of the method Item_func_reverse::val_str
  for the REVERSE function modified the argument of the function.
  This led to wrong results for expressions that contained
  REVERSE(ref) if ref occurred somewhere else in the expressions.
  
  The implementation of Item_func_reverse::val_str has been changed
  to make the argument intact.
sql/item_strfunc.h:
  Fixed bug #18243.
  Added tmp_value to the Item_func_reverse class to store
  the result of the function. It erroneously replaced the 
  argument before this fix.
This commit is contained in:
unknown
2006-07-06 11:11:49 -07:00
parent 52a1639b0e
commit cf7627bce0
4 changed files with 54 additions and 18 deletions
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15
mysql-test/r/func_str.result
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@@ -1021,4 +1021,19 @@ select * from t1 where f1='test' and (f2= sha("TEST") or f2= sha("test"));
f1 f2
test a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
drop table t1;
CREATE TABLE t1 (a varchar(10));
INSERT INTO t1 VALUES ('abc'), ('xyz');
SELECT a, CONCAT(a,' ',a) AS c FROM t1
HAVING LEFT(c,LENGTH(c)-INSTR(REVERSE(c)," ")) = a;
a c
abc abc abc
xyz xyz xyz
SELECT a, CONCAT(a,' ',a) AS c FROM t1
HAVING LEFT(CONCAT(a,' ',a),
LENGTH(CONCAT(a,' ',a))-
INSTR(REVERSE(CONCAT(a,' ',a))," ")) = a;
a c
abc abc abc
xyz xyz xyz
DROP TABLE t1;
End of 4.1 tests