Post-review fixes for bug #19089

mysql-test/r/view.result

@@ -2716,7 +2716,7 @@ SELECT * FROM t2;
 a	m
 xxx	1
 yyy	5
-NULL	0
+xxx	0
 DROP VIEW v1;
 DROP TABLE t1,t2;
 CREATE TABLE t1 (id int PRIMARY KEY, e ENUM('a','b') NOT NULL DEFAULT 'b');

sql/field.cc

@@ -1228,12 +1228,11 @@ Field::Field(char *ptr_arg,uint32 length_arg,uchar *null_ptr_arg,
    field_name(field_name_arg),
    query_id(0), key_start(0), part_of_key(0), part_of_sortkey(0),
    unireg_check(unireg_check_arg),
-   field_length(length_arg),null_bit(null_bit_arg)
+   field_length(length_arg), null_bit(null_bit_arg), dflt_field(0)
 {
   flags=null_ptr ? 0: NOT_NULL_FLAG;
   comment.str= (char*) "";
   comment.length=0;
-  dflt_field= 0;
 }
 
 uint Field::offset()

sql/field.h

@@ -53,6 +53,11 @@ class Field
 
   char		*ptr;			// Position to field in record
   uchar		*null_ptr;		// Byte where null_bit is
+  /*
+    dflt_field is used only for the fields of temporary tables.
+    It points to the default value of the field in another table
+    from which this field has been created.
+  */ 
   Field         *dflt_field;            // Field to copy default value from
   /*
     Note that you can use table->in_use as replacement for current_thd member 

sql/sql_select.cc

@@ -8697,7 +8697,10 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
       if (is_null)
         field->set_null();
       else
+      {
+        field->set_notnull();
         memcpy(field->ptr, from, field->pack_length());
+      }
     } 
 
     if (from_field[i])