diff --git a/myisam/sort.c b/myisam/sort.c
index f2f8c8ef7ec..fabd713ef45 100644
--- a/myisam/sort.c
+++ b/myisam/sort.c
@@ -587,13 +587,15 @@ int thr_write_keys(MI_SORT_PARAM *sort_param)
 
       while (!got_error &&
 	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)&key_length,
-			sizeof(key_length)) &&
-	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)mergebuf,
-			(uint) key_length))
+			sizeof(key_length)))
       {
-	if (_mi_ck_write(info,sinfo->key,(uchar*) mergebuf,
-			 key_length - info->s->rec_reflength))
-	  got_error=1;
+        byte ft_buf[HA_FT_MAXBYTELEN + HA_FT_WLEN + 10];
+        if (key_length > sizeof(ft_buf) ||
+            my_b_read(&sinfo->tempfile_for_exceptions, (byte*)ft_buf,
+                      (uint)key_length) ||
+            _mi_ck_write(info, sinfo->key, (uchar*)ft_buf,
+                         key_length - info->s->rec_reflength))
+          got_error=1;
       }
     }
   }
diff --git a/mysql-test/r/ctype_big5.result b/mysql-test/r/ctype_big5.result
index 8d2c39df853..01b59b93b52 100644
--- a/mysql-test/r/ctype_big5.result
+++ b/mysql-test/r/ctype_big5.result
@@ -128,3 +128,9 @@ SELECT * FROM t1;
 a
 ùØ
 DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(50) CHARACTER SET big5 NOT NULL, FULLTEXT(a));
+INSERT INTO t1 VALUES(0xA741ADCCA66EB6DC20A7DAADCCABDCA66E);
+SELECT HEX(a) FROM t1 WHERE MATCH(a) AGAINST (0xA741ADCCA66EB6DC IN BOOLEAN MODE);
+HEX(a)
+A741ADCCA66EB6DC20A7DAADCCABDCA66E
+DROP TABLE t1;
diff --git a/mysql-test/r/fulltext.result b/mysql-test/r/fulltext.result
index 1a79f6d9736..6a41035eb7b 100644
--- a/mysql-test/r/fulltext.result
+++ b/mysql-test/r/fulltext.result
@@ -422,3 +422,11 @@ SELECT COUNT(*) FROM t1 WHERE MATCH(t) AGAINST ('"osnabr
 COUNT(*)
 1
 DROP TABLE t1;
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;
diff --git a/mysql-test/t/ctype_big5.test b/mysql-test/t/ctype_big5.test
index e4fb1d2a32b..73d9f06042c 100644
--- a/mysql-test/t/ctype_big5.test
+++ b/mysql-test/t/ctype_big5.test
@@ -28,4 +28,12 @@ INSERT INTO t1 VALUES ('
 SELECT * FROM t1;
 DROP TABLE t1;
 
+#
+# BUG#12075 - FULLTEXT non-functional for big5 strings
+#
+CREATE TABLE t1 (a CHAR(50) CHARACTER SET big5 NOT NULL, FULLTEXT(a));
+INSERT INTO t1 VALUES(0xA741ADCCA66EB6DC20A7DAADCCABDCA66E);
+SELECT HEX(a) FROM t1 WHERE MATCH(a) AGAINST (0xA741ADCCA66EB6DC IN BOOLEAN MODE);
+DROP TABLE t1;
+
 # End of 4.1 tests
diff --git a/mysql-test/t/fulltext.test b/mysql-test/t/fulltext.test
index b0b70d40e5c..300bea1c917 100644
--- a/mysql-test/t/fulltext.test
+++ b/mysql-test/t/fulltext.test
@@ -339,4 +339,15 @@ INSERT INTO t1 VALUES('Mit freundlichem Gr
 SELECT COUNT(*) FROM t1 WHERE MATCH(t) AGAINST ('"osnabrück"' IN BOOLEAN MODE);
 DROP TABLE t1;
 
+#
+# BUG#11684 - repair crashes mysql when table has fulltext index
+#
+
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;
+
 # End of 4.1 tests
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index e26b6a75b7c..b669a8c426d 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -2632,7 +2632,11 @@ int group_concat_key_cmp_with_distinct(void* arg, byte* key1,
       the temporary table, not the original field
     */
     Field *field= (*field_item)->get_tmp_table_field();
-    if (field)
+    /* 
+      If field_item is a const item then either get_tp_table_field returns 0
+      or it is an item over a const table. 
+    */
+    if (field && !(*field_item)->const_item())
     {
       int res;
       uint offset= field->offset() - table->s->null_bytes;
@@ -2666,8 +2670,11 @@ int group_concat_key_cmp_with_order(void* arg, byte* key1, byte* key2)
       the temporary table, not the original field
     */
     Field *field= item->get_tmp_table_field();
-    /* If the item is a constant, there is no tmp table field */
-    if (field)
+    /* 
+      If item is a const item then either get_tp_table_field returns 0
+      or it is an item over a const table. 
+    */
+    if (field && !item->const_item())
     {
       int res;
       uint offset= field->offset() - table->s->null_bytes;
@@ -3037,7 +3044,6 @@ bool Item_func_group_concat::setup(THD *thd)
     DBUG_RETURN(TRUE);
 
   count_field_types(tmp_table_param,all_fields,0);
-  tmp_table_param->need_const= 1;
   DBUG_ASSERT(table == 0);
   /*
     We have to create a temporary table to get descriptions of fields
diff --git a/sql/sql_class.h b/sql/sql_class.h
index 90112bd650b..3043a87efc0 100644
--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -1705,14 +1705,13 @@ public:
   bool  using_indirect_summary_function;
   /* If >0 convert all blob fields to varchar(convert_blob_length) */
   uint  convert_blob_length; 
-  bool need_const; /* <=> const items are saved in tmp table */
   CHARSET_INFO *table_charset; 
   bool schema_table;
 
   TMP_TABLE_PARAM()
     :copy_field(0), group_parts(0),
-    group_length(0), group_null_parts(0), convert_blob_length(0),
-    need_const(0), schema_table(0)
+     group_length(0), group_null_parts(0), convert_blob_length(0),
+     schema_table(0)
   {}
   ~TMP_TABLE_PARAM()
   {
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index bf5b0542917..c09a35c1fc0 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -8254,8 +8254,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
 	param->using_indirect_summary_function=1;
 	continue;
       }
-      if (item->const_item() && (int) hidden_field_count <= 0 &&
-          !param->need_const)
+      if (item->const_item() && (int) hidden_field_count <= 0)
         continue; // We don't have to store this
     }
     if (type == Item::SUM_FUNC_ITEM && !group && !save_sum_fields)
diff --git a/strings/ctype-big5.c b/strings/ctype-big5.c
index d311859907f..9ccbb149523 100644
--- a/strings/ctype-big5.c
+++ b/strings/ctype-big5.c
@@ -61,12 +61,12 @@ static uchar NEAR ctype_big5[257] =
   2,2,2,2,2,2,2,2,2,2,2,16,16,16,16,32,
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+  0,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+  3,3,3,3,3,3,3,3,3,3,0,0,0,0,0,0,
 };
 
 static uchar NEAR to_lower_big5[]=