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Fixed bug #31471: decimal_bin_size: Assertion `scale >= 0 &&

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precision > 0 && scale <= precision'.

A sign of a resulting item of the IFNULL function was not
updated and the maximal length of this result was calculated
improperly. Correct algorithm was copy&pasted from the IF
function implementation.


sql/item_cmpfunc.cc:
  Fixed bug #31471.
  The Item_func_ifnull::fix_length_and_dec method has been
  modified to update the Item_func_ifnull::unsigned_flag field
  and to take this field into account when calculating the
  Item_func_ifnull::max_length value.
  (See Item_func_if::fix_length_and_dec for reference).
mysql-test/t/null.test:
  Added test case for bug #31471.
mysql-test/r/null.result:
  Added test case for bug #31471.
mysql-test/r/create.result:
  Update test case after the bugfix of bug #31471.
This commit is contained in:
unknown
2007-10-10 20:14:29 +05:00
parent 6146c0c75d
commit c866f8015f
4 changed files with 64 additions and 8 deletions
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27
mysql-test/t/null.test
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@@ -1,6 +1,6 @@
# Initialise
--disable_warnings
drop table if exists t1;
drop table if exists t1, t2;
--enable_warnings
#
@@ -231,4 +231,27 @@ drop table bug19145a;
drop table bug19145b;
drop table bug19145c;
# End of 4.1 tests
--echo # End of 4.1 tests
--echo #
--echo # Bug #31471: decimal_bin_size: Assertion `scale >= 0 &&
--echo # precision > 0 && scale <= precision'
--echo #
CREATE TABLE t1 (a DECIMAL (1, 0) ZEROFILL, b DECIMAL (1, 0) ZEROFILL);
INSERT INTO t1 (a, b) VALUES (0, 0);
CREATE TABLE t2 SELECT IFNULL(a, b) FROM t1;
DESCRIBE t2;
DROP TABLE t2;
CREATE TABLE t2 SELECT IFNULL(a, NULL) FROM t1;
DESCRIBE t2;
DROP TABLE t2;
CREATE TABLE t2 SELECT IFNULL(NULL, b) FROM t1;
DESCRIBE t2;
DROP TABLE t1, t2;
--echo # End of 5.0 tests