diff --git a/configure.in b/configure.in
index 83cc012111d..d323ce9f726 100644
--- a/configure.in
+++ b/configure.in
@@ -10,7 +10,7 @@ AC_CANONICAL_SYSTEM
 #
 # When changing major version number please also check switch statement
 # in mysqlbinlog::check_master_version().
-AM_INIT_AUTOMAKE(mysql, 5.1.35)
+AM_INIT_AUTOMAKE(mysql, 5.1.36)
 AM_CONFIG_HEADER([include/config.h:config.h.in])
 
 PROTOCOL_VERSION=10
diff --git a/mysql-test/include/mix1.inc b/mysql-test/include/mix1.inc
index c9cbf2d2839..7c87949830f 100644
--- a/mysql-test/include/mix1.inc
+++ b/mysql-test/include/mix1.inc
@@ -1516,4 +1516,23 @@ DROP TABLE t1;
 # DROP TABLE t1;
 #
 
+--echo #
+--echo # Bug #44290: explain crashes for subquery with distinct in
+--echo #             SQL_SELECT::test_quick_select
+--echo #             (reproduced only with InnoDB tables)
+--echo #
+
+eval
+CREATE TABLE t1 (c1 INT, c2 INT, c3 INT, KEY (c3), KEY (c2, c3))
+  ENGINE=$engine_type;
+INSERT INTO t1 VALUES (1,1,1), (1,1,1), (1,1,2), (1,1,1), (1,1,2);
+
+SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
+                 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+EXPLAIN 
+SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
+                 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests
diff --git a/mysql-test/r/innodb_mysql.result b/mysql-test/r/innodb_mysql.result
index 3f830378afa..191a8578d4c 100644
--- a/mysql-test/r/innodb_mysql.result
+++ b/mysql-test/r/innodb_mysql.result
@@ -1687,6 +1687,25 @@ vid	tid	idx	name	type
 3	1	2	c1	NULL
 3	1	1	pk	NULL
 DROP TABLE t1;
+#
+# Bug #44290: explain crashes for subquery with distinct in
+#             SQL_SELECT::test_quick_select
+#             (reproduced only with InnoDB tables)
+#
+CREATE TABLE t1 (c1 INT, c2 INT, c3 INT, KEY (c3), KEY (c2, c3))
+ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1,1,1), (1,1,1), (1,1,2), (1,1,1), (1,1,2);
+SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
+FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+1
+1
+EXPLAIN 
+SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
+FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
+2	DERIVED	t1	index	c3,c2	c2	10	NULL	5	
+DROP TABLE t1;
 End of 5.1 tests
 drop table if exists t1, t2, t3;
 create table t1(a int);
diff --git a/mysys/safemalloc.c b/mysys/safemalloc.c
index 36d07b475e9..c484f1d4c54 100644
--- a/mysys/safemalloc.c
+++ b/mysys/safemalloc.c
@@ -174,7 +174,7 @@ void *_mymalloc(size_t size, const char *filename, uint lineno, myf MyFlags)
   data[size + 3]= MAGICEND3;
   irem->filename= (char *) filename;
   irem->linenum= lineno;
-  irem->datasize= (uint32) size;
+  irem->datasize= size;
   irem->prev=	  NULL;
 
   /* Add this remember structure to the linked list */
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 901e058d934..21d22e250ec 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -13471,6 +13471,7 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
   {
     select->cleanup();				// filesort did select
     tab->select= 0;
+    table->quick_keys.clear_all();  // as far as we cleanup select->quick
   }
   tab->select_cond=0;
   tab->last_inner= 0;