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DROP TABLE IF EXISTS t1,t2;
CREATE TABLE t1 (a ENUM('a') CHARACTER SET latin1 PRIMARY KEY);
INSERT INTO t1 VALUES ('a');
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (a ENUM('a','A') CHARACTER SET latin1 COLLATE latin1_bin);
INSERT INTO t2 VALUES ('a'),('A');
SELECT t1.* FROM t1 JOIN t2 ON t1.a COLLATE latin1_swedish_ci=t2.a;
SELECT t1.* FROM t1 LEFT JOIN t2 ON t1.a COLLATE latin1_swedish_ci=t2.a;
This script correctly returns 2 rows for the both SELECT queries.
+---+ | a | +---+ | a | | a | +---+ 2 rows in set (0.00 sec)
If I now add a primary key on t2 and rerun the queries again:
ALTER TABLE t2 ADD PRIMARY KEY(a); SELECT t1.* FROM t1 JOIN t2 ON t1.a COLLATE latin1_swedish_ci=t2.a; SELECT t1.* FROM t1 LEFT JOIN t2 ON t1.a COLLATE latin1_swedish_ci=t2.a;
both queries return only one rows:
+---+ | a | +---+ | a | +---+ 1 row in set (0.00 sec)
This is wrong. Two rows should always be returned.
The same problem is repeatable if I change data type for t1.a from ENUM to VARCHAR(10) or SET('a').
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