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-rw-r--r--mysql-test/main/join.test15
1 files changed, 15 insertions, 0 deletions
diff --git a/mysql-test/main/join.test b/mysql-test/main/join.test
index e929854251a..1668787d33e 100644
--- a/mysql-test/main/join.test
+++ b/mysql-test/main/join.test
@@ -1820,3 +1820,18 @@ drop table t1,t2,t3;
drop table t1000,t10,t03;
--echo # End of 10.3 tests
+
+--echo #
+--echo # MDEV-30080 Wrong result with LEFT JOINs involving constant tables
+--echo #
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1);
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1),(1);
+CREATE TABLE t3 (c INT PRIMARY KEY) ENGINE=MyISAM;
+SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.b = t3.c) ON t1.a = t2.b;
+SELECT COUNT(*) FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.b = t3.c) ON t1.a = t2.b;
+DROP TABLE t1, t2, t3;
+
+--echo # End of 10.5 tests