fixed bug reported by Walrus & Miguel in exists subselect

mysql-test/r/subselect.result:
  added test suite of EXISTS clause
mysql-test/t/subselect.test:
  added test suite of EXISTS clause
sql/item_subselect.cc:
  added checking out of memory
  fixed bug in exists subselect

2 files changed, 20 insertions, 4 deletions

diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index bd92c496f29..fb91bebd727 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -1,7 +1,7 @@
 select (select 2);
 (select 2)
 2
-drop table if exists t1,t2,t3,t4;
+drop table if exists t1,t2,t3,t4,attend,clinic;
 create table t1 (a int);
 create table t2 (a int, b int);
 create table t3 (a int);
@@ -82,4 +82,13 @@ select b,max(a) as ma from t4 group by b having b >= (select max(t2.a)
 from t2 where t2.b=t4.b);
 b	ma
 7	12
-drop table t1,t2,t3,t4;
+create table attend (patient_uq int, clinic_uq int, index i1 (clinic_uq));
+create table clinic( uq int primary key, name char(25));
+insert into clinic values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
+insert into attend values (1,1),(1,2),(2,2),(1,3);
+select * from attend where exists (select * from clinic where uq = clinic_uq);
+patient_uq	clinic_uq
+1	1
+1	2
+2	2
+drop table t1,t2,t3,t4,attend,clinic;
diff --git a/mysql-test/t/subselect.test b/mysql-test/t/subselect.test
index 7b1ebdcbc27..16ba6c9e602 100644
--- a/mysql-test/t/subselect.test
+++ b/mysql-test/t/subselect.test
@@ -1,6 +1,6 @@
 
 select (select 2);
-drop table if exists t1,t2,t3,t4;
+drop table if exists t1,t2,t3,t4,attend,clinic;
 create table t1 (a int);
 create table t2 (a int, b int);
 create table t3 (a int);
@@ -33,4 +33,11 @@ select b,max(a) as ma from t4 group by b having b < (select max(t2.a)
 from t2 where t2.b=t4.b);
 select b,max(a) as ma from t4 group by b having b >= (select max(t2.a)
 from t2 where t2.b=t4.b);
-drop table t1,t2,t3,t4;
+
+create table attend (patient_uq int, clinic_uq int, index i1 (clinic_uq));
+create table clinic( uq int primary key, name char(25));
+insert into clinic values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
+insert into attend values (1,1),(1,2),(2,2),(1,3);
+select * from attend where exists (select * from clinic where uq = clinic_uq);
+
+drop table t1,t2,t3,t4,attend,clinic;