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diff --git a/mysql-test/main/count_distinct.test b/mysql-test/main/count_distinct.test
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+++ b/mysql-test/main/count_distinct.test
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+#
+# Problem with count(distinct)
+#
+
+--disable_warnings
+drop table if exists t1,t2,t3;
+--enable_warnings
+
+create table t1 (libname varchar(21) not null, city text, primary key (libname));
+create table t2 (isbn varchar(21) not null, author text, title text, primary key (isbn));
+create table t3 (isbn varchar(21) not null, libname varchar(21) not null, quantity int ,primary key (isbn,libname));
+insert into t2 values ('001','Daffy','A duck''s life');
+insert into t2 values ('002','Bugs','A rabbit\'s life');
+insert into t2 values ('003','Cowboy','Life on the range');
+insert into t2 values ('000','Anonymous','Wanna buy this book?');
+insert into t2 values ('004','Best Seller','One Heckuva book');
+insert into t2 values ('005','EveryoneBuys','This very book');
+insert into t2 values ('006','San Fran','It is a san fran lifestyle');
+insert into t2 values ('007','BerkAuthor','Cool.Berkley.the.book');
+insert into t3 values('000','New York Public Libra','1');
+insert into t3 values('001','New York Public Libra','2');
+insert into t3 values('002','New York Public Libra','3');
+insert into t3 values('003','New York Public Libra','4');
+insert into t3 values('004','New York Public Libra','5');
+insert into t3 values('005','New York Public Libra','6');
+insert into t3 values('006','San Fransisco Public','5');
+insert into t3 values('007','Berkeley Public1','3');
+insert into t3 values('007','Berkeley Public2','3');
+insert into t3 values('001','NYC Lib','8');
+insert into t1 values ('New York Public Libra','New York');
+insert into t1 values ('San Fransisco Public','San Fran');
+insert into t1 values ('Berkeley Public1','Berkeley');
+insert into t1 values ('Berkeley Public2','Berkeley');
+insert into t1 values ('NYC Lib','New York');
+select t2.isbn,city,t1.libname,count(t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city,t1.libname;
+select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city having count(distinct t1.libname) > 1;
+select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city having count(distinct concat(t1.libname,'a')) > 1;
+
+select t2.isbn,city,@bar:=t1.libname,count(distinct t1.libname) as a
+       from t3 left join t1 on t3.libname=t1.libname left join t2
+       on t3.isbn=t2.isbn group by city having count(distinct
+       t1.libname) > 1;
+#
+# Wrong result, see bug#49872
+# 
+SELECT @bar;
+
+select t2.isbn,city,concat(@bar:=t1.libname),count(distinct t1.libname) as a
+       from t3 left join t1 on t3.libname=t1.libname left join t2
+       on t3.isbn=t2.isbn group by city having count(distinct
+       t1.libname) > 1;
+#
+# Wrong result, see bug#49872
+# 
+SELECT @bar;
+
+drop table t1, t2, t3;
+
+#
+# Problem with LEFT JOIN
+#
+
+create table t1 (f1 int);
+insert into t1 values (1);
+create table t2 (f1 int,f2 int);
+select t1.f1,count(distinct t2.f2),count(distinct 1,NULL) from t1 left join t2 on t1.f1=t2.f1 group by t1.f1;
+drop table t1,t2;
+
+
+#
+# Empty tables
+#
+create table t1 (f int);
+select count(distinct f) from t1;
+drop table t1;
+
+# End of 4.1 tests
+
+#
+# Bug #6515
+#
+
+create table t1 (a char(3), b char(20), primary key (a, b));
+insert into t1 values ('ABW', 'Dutch'), ('ABW', 'English');
+select count(distinct a) from t1 group by b;
+drop table t1;
+
+#
+# Bug #9593 "The combination of COUNT, DISTINCT and CONCAT 
+#            seems to lock the server"
+# Bug appears only on Windows system
+#
+
+create table t1 (f1 int, f2 int);
+insert into t1 values (0,1),(1,2);
+select count(distinct if(f1,3,f2)) from t1;
+drop table t1;
+
+#
+# Bug #51980 "mysqld service crashes with a simple COUNT(DISTINCT) query 
+#             over a view"
+#
+
+create table t1 (i int);
+insert into t1 values (0), (1);
+create view v1 as select * from t1;
+select count(distinct i) from v1;
+drop table t1;
+drop view v1;
+
+#
+# MDEV-12136 SELECT COUNT(DISTINCT) returns the wrong value when tmp_table_size is limited
+#
+create table t1 (user_id char(64) character set utf8);
+insert t1 values(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),(16),(17);
+set @@tmp_table_size = 1024;
+select count(distinct user_id) from t1;
+alter table t1 modify user_id char(128) character set utf8;
+select count(distinct user_id) from t1;
+drop table t1;
+set @@tmp_table_size = default;
+
+#
+# MDEV-13457: Wrong result for aggregate function with distinct clause when the value for 
+# tmp_table_size is small
+#
+
+create table t1 (
+a VARCHAR(1020),
+b int
+);
+insert into t1 values
+( 0 , 1 ),
+( 1 , 2 ),
+( 2 , 3 ),
+( 3 , 4 ),
+( 4 , 5 ),
+( 5 , 6 ),
+( 6 , 7 ),
+( 7 , 8 ),
+( 8 , 9 ),
+( 9 , 10 ),
+( 0 , 11 ),
+( 1 , 12 ),
+( 2 , 13 ),
+( 3 , 14 );
+set @@tmp_table_size=1024;
+select count(distinct a) from t1;
+drop table t1;
+set @@tmp_table_size = default;
+
+#
+# End of 5.5 tests
+#