1 files changed, 43 insertions, 0 deletions
diff --git a/mysql-test/t/merge.test b/mysql-test/t/merge.test
index 0d90468fc8d..39c805d2b5b 100644
--- a/mysql-test/t/merge.test
+++ b/mysql-test/t/merge.test
@@ -1515,6 +1515,49 @@ insert into m1 (col1) values (1);
 
 drop table m1, t1;
 
+--echo #
+--echo # Bug#45800 crash when replacing into a merge table and there is a duplicate
+--echo #
+
+--echo # Replace duplicate value in child table when merge table doesn't have key
+CREATE TABLE t1 (c1 INT PRIMARY KEY) ENGINE=MyISAM;
+CREATE TABLE m1 (c1 INT NOT NULL) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
+INSERT INTO m1  VALUES (666);
+SELECT * FROM m1;
+--echo # insert the duplicate value into the merge table
+REPLACE INTO m1 VALUES (666);
+SELECT * FROM m1;
+DROP TABLE m1, t1;
+
+--echo # Insert... on duplicate key update (with duplicate values in the table)
+CREATE TABLE t1 (c1 INT PRIMARY KEY) ENGINE=MyISAM;
+CREATE TABLE m1 (c1 INT NOT NULL) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
+INSERT INTO m1  VALUES (666);
+SELECT * FROM m1;
+--echo # insert the duplicate value into the merge table
+INSERT INTO m1 VALUES (666) ON DUPLICATE KEY UPDATE c1=c1+1;
+SELECT * FROM m1;
+DROP TABLE m1, t1;
+
+--echo # Insert duplicate value on MERGE table, where, MERGE has a key but MyISAM has more keys
+CREATE TABLE t1 (c1 INT, c2 INT, UNIQUE (c1), UNIQUE (c2));
+CREATE TABLE m1 (c1 INT, c2 INT, UNIQUE (c1)) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
+INSERT INTO m1 VALUES (1,2);
+--echo # insert the duplicate value into the merge table
+--error ER_DUP_ENTRY
+INSERT INTO m1 VALUES (3,2);
+DROP TABLE m1,t1;
+
+--echo # Try to define MERGE and MyISAM with keys on different columns
+CREATE TABLE t1 (c1 INT, c2 INT, UNIQUE (c1));
+CREATE TABLE m1 (c1 INT, c2 INT, UNIQUE (c2)) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
+--echo # Try accessing the merge table for inserts (error occurs)
+--error ER_WRONG_MRG_TABLE
+INSERT INTO m1 VALUES (1,2);
+--error ER_WRONG_MRG_TABLE
+INSERT INTO m1 VALUES (1,4);
+DROP TABLE m1,t1;
+
 #
 #Bug #44040   MySQL allows creating a MERGE table upon VIEWs but crashes 
 #when using it