cleanup: part_func_string and subpart_func_string

Remove now-unused part_func_string and subpart_func_string
from partition_info.

sql/partition_info.cc

@@ -1683,15 +1683,11 @@ bool partition_info::set_part_expr(THD *thd, char *start_token, Item *item_ptr,
   {
     list_of_subpart_fields= FALSE;
     subpart_expr= item_ptr;
-    subpart_func_string= func_string;
-    subpart_func_len= expr_len;
   }
   else
   {
     list_of_part_fields= FALSE;
     part_expr= item_ptr;
-    part_func_string= func_string;
-    part_func_len= expr_len;
   }
   return FALSE;
 }

sql/partition_info.h

@@ -165,9 +165,6 @@ class partition_info : public Sql_alloc
   longlong err_value;
   char* part_info_string;
 
-  char *part_func_string;
-  char *subpart_func_string;
-
   partition_element *curr_part_elem;     // part or sub part
   partition_element *current_partition;  // partition
   part_elem_value *curr_list_val;
@@ -188,8 +185,6 @@ class partition_info : public Sql_alloc
   partition_type subpart_type;
 
   uint part_info_len;
-  uint part_func_len;
-  uint subpart_func_len;
 
   uint num_parts;
   uint num_subparts;
@@ -257,13 +252,11 @@ class partition_info : public Sql_alloc
     bitmaps_are_initialized(FALSE),
     list_array(NULL), err_value(0),
     part_info_string(NULL),
-    part_func_string(NULL), subpart_func_string(NULL),
     curr_part_elem(NULL), current_partition(NULL),
     curr_list_object(0), num_columns(0), table(NULL),
     default_engine_type(NULL),
     part_type(NOT_A_PARTITION), subpart_type(NOT_A_PARTITION),
     part_info_len(0),
-    part_func_len(0), subpart_func_len(0),
     num_parts(0), num_subparts(0),
     count_curr_subparts(0),
     num_list_values(0), num_part_fields(0), num_subpart_fields(0),

sql/sql_partition.cc

@@ -4110,39 +4110,6 @@ bool mysql_unpack_partition(THD *thd,
   DBUG_ASSERT(part_info->default_engine_type == default_db_type);
   DBUG_ASSERT(part_info->default_engine_type->db_type != DB_TYPE_UNKNOWN);
   DBUG_ASSERT(part_info->default_engine_type != partition_hton);
-
-  {
-  /*
-    This code part allocates memory for the serialised item information for
-    the partition functions. In most cases this is not needed but if the
-    table is used for SHOW CREATE TABLES or ALTER TABLE that modifies
-    partition information it is needed and the info is lost if we don't
-    save it here so unfortunately we have to do it here even if in most
-    cases it is not needed. This is a consequence of that item trees are
-    not serialisable.
-  */
-    uint part_func_len= part_info->part_func_len;
-    uint subpart_func_len= part_info->subpart_func_len; 
-    char *part_func_string= NULL;
-    char *subpart_func_string= NULL;
-    if ((part_func_len &&
-         !((part_func_string= (char*) thd->alloc(part_func_len)))) ||
-        (subpart_func_len &&
-         !((subpart_func_string= (char*) thd->alloc(subpart_func_len)))))
-    {
-      mem_alloc_error(part_func_len);
-      thd->free_items();
-      goto end;
-    }
-    if (part_func_len)
-      memcpy(part_func_string, part_info->part_func_string, part_func_len);
-    if (subpart_func_len)
-      memcpy(subpart_func_string, part_info->subpart_func_string,
-             subpart_func_len);
-    part_info->part_func_string= part_func_string;
-    part_info->subpart_func_string= subpart_func_string;
-  }
-
   result= FALSE;
 end:
   end_lex_with_single_table(thd, table, old_lex);