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MDEV-9862 Illegal mix of collation, when comparing column with CASE expression

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This commit is contained in:
Alexander Barkov 2016-04-02 00:04:47 +04:00
parent 11b77e9b18
commit 777c2131dd
3 changed files with 31 additions and 1 deletions
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14
mysql-test/r/ctype_cp850.result Normal file
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@ -0,0 +1,14 @@
#
# Start of 5.5 tests
#
#
# MDEV-9862 Illegal mix of collation, when comparing column with CASE expression
#
SET NAMES cp850;
CREATE TABLE t1 (a CHAR(1) CHARACTER SET latin1);
SELECT a FROM t1 WHERE CASE a WHEN 'aaaa' THEN 'Y' WHEN 'aaaa' THEN 'Y' ELSE NULL END <> a;
a
DROP TABLE t1;
#
# End of 5.5 tests
#

16
mysql-test/t/ctype_cp850.test Normal file
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@ -0,0 +1,16 @@
--echo #
--echo # Start of 5.5 tests
--echo #
--echo #
--echo # MDEV-9862 Illegal mix of collation, when comparing column with CASE expression
--echo #
SET NAMES cp850;
CREATE TABLE t1 (a CHAR(1) CHARACTER SET latin1);
SELECT a FROM t1 WHERE CASE a WHEN 'aaaa' THEN 'Y' WHEN 'aaaa' THEN 'Y' ELSE NULL END <> a;
DROP TABLE t1;
--echo #
--echo # End of 5.5 tests
--echo #

2
sql/item.h
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@ -2175,7 +2175,7 @@ public:
max_length= 0;
name= name_par ? name_par : (char*) "NULL";
fixed= 1;
collation.set(&my_charset_bin, DERIVATION_IGNORABLE);
collation.set(&my_charset_bin, DERIVATION_IGNORABLE, MY_REPERTOIRE_ASCII);
}
enum Type type() const { return NULL_ITEM; }
bool eq(const Item *item, bool binary_cmp) const;