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Fixed bug #27130. If the third argument of the function SUBSTR was

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represented by an expression of the type UNSIGNED INT and this 
expression was evaluated to 0 then the function erroneously returned
the value of the first argument instead of an empty string. 

This problem was introduced by the patch for bug 10963.

The problem has been resolved by a proper modification of the code of
Item_func_substr::val_str.


mysql-test/r/func_str.result:
  Added a test case for bug #27130.
mysql-test/t/func_str.test:
  Added a test case for bug #27130.
This commit is contained in:
unknown
2007-06-17 11:23:19 -07:00
parent bcd6183fe7
commit a07b055b9a
3 changed files with 34 additions and 2 deletions
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15
mysql-test/t/func_str.test
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@ -1076,4 +1076,19 @@ SELECT * FROM (SELECT * FROM v1) x;
DROP TABLE t1, t2;
DROP VIEW v1;
#
# Bug #27130: SUBSTR with UNSIGNED 0 as the last argument
#
SELECT SUBSTR('foo',1,0) FROM DUAL;
SELECT SUBSTR('foo',1,CAST(0 AS SIGNED)) FROM DUAL;
SELECT SUBSTR('foo',1,CAST(0 AS UNSIGNED)) FROM DUAL;
CREATE TABLE t1 (a varchar(10), len int unsigned);
INSERT INTO t1 VALUES ('bar', 2), ('foo', 0);
SELECT SUBSTR(a,1,len) FROM t1;
DROP TABLE t1;
--echo End of 5.0 tests