diff --git a/mysql-test/r/partition.result b/mysql-test/r/partition.result
index 8b95f4e7e12..05350db1ee0 100644
--- a/mysql-test/r/partition.result
+++ b/mysql-test/r/partition.result
@@ -1985,4 +1985,23 @@ CREATE TABLE t1(id INT,KEY(id)) ENGINE=MYISAM
 PARTITION BY HASH(id) PARTITIONS 2;
 DROP TABLE t1;
 SET SESSION SQL_MODE=DEFAULT;
+#
+# BUG#45816 - assertion failure with index containing double 
+#             column on partitioned table
+#
+CREATE TABLE t1 (
+a INT DEFAULT NULL,
+b DOUBLE DEFAULT NULL,
+c INT DEFAULT NULL,
+KEY idx2(b,a)
+) PARTITION BY HASH(c) PARTITIONS 3;
+INSERT INTO t1 VALUES (6,8,9);
+INSERT INTO t1 VALUES (6,8,10);
+SELECT  1 FROM t1 JOIN t1 AS t2 USING (a) FOR UPDATE;
+1
+1
+1
+1
+1
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/t/partition.test b/mysql-test/t/partition.test
index 542a992bb0e..0b497d86623 100644
--- a/mysql-test/t/partition.test
+++ b/mysql-test/t/partition.test
@@ -1979,4 +1979,23 @@ CREATE TABLE t1(id INT,KEY(id)) ENGINE=MYISAM
 DROP TABLE t1;
 SET SESSION SQL_MODE=DEFAULT;
 
+
+--echo #
+--echo # BUG#45816 - assertion failure with index containing double 
+--echo #             column on partitioned table
+--echo #
+
+CREATE TABLE t1 (
+  a INT DEFAULT NULL,
+  b DOUBLE DEFAULT NULL,
+  c INT DEFAULT NULL,
+  KEY idx2(b,a)
+) PARTITION BY HASH(c) PARTITIONS 3;
+
+INSERT INTO t1 VALUES (6,8,9);
+INSERT INTO t1 VALUES (6,8,10);
+
+SELECT  1 FROM t1 JOIN t1 AS t2 USING (a) FOR UPDATE;
+
+DROP TABLE t1;
 --echo End of 5.1 tests
diff --git a/sql/field.cc b/sql/field.cc
index 452dfc3ae55..3bfb54fbd15 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -4598,7 +4598,6 @@ bool Field_double::send_binary(Protocol *protocol)
 
 int Field_double::cmp(const uchar *a_ptr, const uchar *b_ptr)
 {
-  ASSERT_COLUMN_MARKED_FOR_READ;
   double a,b;
 #ifdef WORDS_BIGENDIAN
   if (table->s->db_low_byte_first)
diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index 562716a7db7..b345648260c 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -3730,7 +3730,7 @@ int ha_partition::index_init(uint inx, bool sorted)
   */
   if (m_lock_type == F_WRLCK)
     bitmap_union(table->read_set, &m_part_info->full_part_field_set);
-  else if (sorted)
+  if (sorted)
   {
     /*
       An ordered scan is requested. We must make sure all fields of the