Remove not used mem_root argument from build_clone(), get_copy() and get_item_copy()

TODO:
- Make get_thd_memroot() inline
  - To do this, we need to reduce dependence of include files, especially
    so that sql_class.h is not depending in item.h

1 files changed, 142 insertions, 142 deletions

diff --git a/sql/item_strfunc.h b/sql/item_strfunc.h
index fbcf69d00ce..5b5826b4637 100644
--- a/sql/item_strfunc.h
+++ b/sql/item_strfunc.h
@@ -147,8 +147,8 @@ public:
     fix_length_and_charset(32, default_charset());
   }
   const char *func_name() const { return "md5"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_md5>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_md5>(thd, this); }
 };
 
 
@@ -159,8 +159,8 @@ public:
   String *val_str_ascii(String *);    
   void fix_length_and_dec();      
   const char *func_name() const { return "sha"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_sha>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_sha>(thd, this); }
 };
 
 class Item_func_sha2 :public Item_str_ascii_checksum_func
@@ -171,8 +171,8 @@ public:
   String *val_str_ascii(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "sha2"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_sha2>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_sha2>(thd, this); }
 };
 
 class Item_func_to_base64 :public Item_str_ascii_checksum_func
@@ -184,8 +184,8 @@ public:
   String *val_str_ascii(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "to_base64"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_to_base64>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_to_base64>(thd, this); }
 };
 
 class Item_func_from_base64 :public Item_str_binary_checksum_func
@@ -197,8 +197,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "from_base64"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_from_base64>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_from_base64>(thd, this); }
 };
 
 #include <my_crypt.h>
@@ -223,8 +223,8 @@ public:
     Item_aes_crypt(thd, a, b) {}
   void fix_length_and_dec();
   const char *func_name() const { return "aes_encrypt"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_aes_encrypt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_aes_encrypt>(thd, this); }
 };
 
 class Item_func_aes_decrypt :public Item_aes_crypt
@@ -234,8 +234,8 @@ public:
     Item_aes_crypt(thd, a, b) {}
   void fix_length_and_dec();
   const char *func_name() const { return "aes_decrypt"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_aes_decrypt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_aes_decrypt>(thd, this); }
 };
 
 
@@ -281,8 +281,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "concat"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_concat>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_concat>(thd, this); }
 };
 
 
@@ -301,9 +301,9 @@ public:
   { }
   String *val_str(String *);
   const char *func_name() const { return "concat_operator_oracle"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
+  Item *get_copy(THD *thd)
   {
-    return get_item_copy<Item_func_concat_operator_oracle>(thd, mem_root, this);
+    return get_item_copy<Item_func_concat_operator_oracle>(thd, this);
   }
 };
 
@@ -321,8 +321,8 @@ public:
     maybe_null= 1;
   }
   const char *func_name() const { return "decode_histogram"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_decode_histogram>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_decode_histogram>(thd, this); }
 };
 
 class Item_func_concat_ws :public Item_str_func
@@ -334,8 +334,8 @@ public:
   void fix_length_and_dec();
   const char *func_name() const { return "concat_ws"; }
   table_map not_null_tables() const { return 0; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_concat_ws>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_concat_ws>(thd, this); }
 };
 
 class Item_func_reverse :public Item_str_func
@@ -346,8 +346,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "reverse"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_reverse>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_reverse>(thd, this); }
 };
 
 
@@ -361,8 +361,8 @@ public:
   void fix_length_and_dec();
   String *val_str_internal(String *str, String *empty_string_for_null);
   const char *func_name() const { return "replace"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_replace>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_replace>(thd, this); }
 };
 
 
@@ -374,8 +374,8 @@ public:
     Item_func_replace(thd, org, find, replace) {}
   String *val_str(String *to) { return val_str_internal(to, &tmp_emtpystr); };
   const char *func_name() const { return "replace_oracle"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_replace_oracle>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_replace_oracle>(thd, this); }
 };
 
 
@@ -400,7 +400,7 @@ public:
   bool fix_fields(THD *thd, Item **ref);
   void fix_length_and_dec();
   const char *func_name() const { return "regexp_replace"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root) { return 0;}
+  Item *get_copy(THD *thd) { return 0;}
 };
 
 
@@ -422,7 +422,7 @@ public:
   bool fix_fields(THD *thd, Item **ref);
   void fix_length_and_dec();
   const char *func_name() const { return "regexp_substr"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root) { return 0; }
+  Item *get_copy(THD *thd) { return 0; }
 };
 
 
@@ -436,8 +436,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "insert"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_insert>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_insert>(thd, this); }
 };
 
 
@@ -459,8 +459,8 @@ public:
   Item_func_lcase(THD *thd, Item *item): Item_str_conv(thd, item) {}
   const char *func_name() const { return "lcase"; }
   void fix_length_and_dec();
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_lcase>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_lcase>(thd, this); }
 };
 
 class Item_func_ucase :public Item_str_conv
@@ -469,8 +469,8 @@ public:
   Item_func_ucase(THD *thd, Item *item): Item_str_conv(thd, item) {}
   const char *func_name() const { return "ucase"; }
   void fix_length_and_dec();
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_ucase>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_ucase>(thd, this); }
 };
 
 
@@ -482,8 +482,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "left"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_left>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_left>(thd, this); }
 };
 
 
@@ -495,8 +495,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "right"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_right>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_right>(thd, this); }
 };
 
 
@@ -512,8 +512,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "substr"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_substr>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_substr>(thd, this); }
 };
 
 class Item_func_substr_oracle :public Item_func_substr
@@ -527,8 +527,8 @@ public:
   Item_func_substr_oracle(THD *thd, Item *a, Item *b, Item *c):
     Item_func_substr(thd, a, b, c) {}
   const char *func_name() const { return "substr_oracle"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_substr_oracle>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_substr_oracle>(thd, this); }
 };
 
 class Item_func_substr_index :public Item_str_func
@@ -540,8 +540,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "substring_index"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_substr_index>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_substr_index>(thd, this); }
 
 };
 
@@ -574,8 +574,8 @@ public:
   const char *func_name() const { return "trim"; }
   void print(String *str, enum_query_type query_type);
   virtual const char *mode_name() const { return "both"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_trim>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_trim>(thd, this); }
 };
 
 
@@ -587,8 +587,8 @@ public:
   String *val_str(String *);
   const char *func_name() const { return "ltrim"; }
   const char *mode_name() const { return "leading"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_ltrim>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_ltrim>(thd, this); }
 };
 
 
@@ -600,8 +600,8 @@ public:
   String *val_str(String *);
   const char *func_name() const { return "rtrim"; }
   const char *mode_name() const { return "trailing"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_rtrim>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_rtrim>(thd, this); }
 };
 
 
@@ -639,8 +639,8 @@ public:
                                           "password" : "old_password"); }
   static char *alloc(THD *thd, const char *password, size_t pass_len,
                      enum PW_Alg al);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_password>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_password>(thd, this); }
 };
 
 
@@ -661,8 +661,8 @@ public:
     max_length = args[0]->max_length + 9;
   }
   const char *func_name() const { return "des_encrypt"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_des_encrypt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_des_encrypt>(thd, this); }
 };
 
 class Item_func_des_decrypt :public Item_str_binary_checksum_func
@@ -683,8 +683,8 @@ public:
       max_length-= 9U;
   }
   const char *func_name() const { return "des_decrypt"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_des_decrypt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_des_decrypt>(thd, this); }
 };
 
 
@@ -719,8 +719,8 @@ public:
   {
     return FALSE;
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_encrypt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_encrypt>(thd, this); }
 };
 
 #include "sql_crypt.h"
@@ -739,8 +739,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "encode"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_encode>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_encode>(thd, this); }
 protected:
   virtual void crypto_transform(String *);
 private:
@@ -754,8 +754,8 @@ class Item_func_decode :public Item_func_encode
 public:
   Item_func_decode(THD *thd, Item *a, Item *seed_arg): Item_func_encode(thd, a, seed_arg) {}
   const char *func_name() const { return "decode"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_decode>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_decode>(thd, this); }
 protected:
   void crypto_transform(String *);
 };
@@ -794,8 +794,8 @@ public:
   }
   const char *func_name() const { return "database"; }
   const char *fully_qualified_func_name() const { return "database()"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_database>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_database>(thd, this); }
 };
 
 
@@ -815,8 +815,8 @@ public:
     max_length= 512 * system_charset_info->mbmaxlen;
     null_value= maybe_null= false;
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_sqlerrm>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_sqlerrm>(thd, this); }
 };
 
 
@@ -847,8 +847,8 @@ public:
   {
     return save_str_value_in_field(field, &str_value);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_user>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_user>(thd, this); }
 };
 
 
@@ -897,8 +897,8 @@ public:
     return mark_unsupported_function(fully_qualified_func_name(), arg,
                                      VCOL_SESSION_FUNC);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_current_role>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_current_role>(thd, this); }
 };
 
 
@@ -910,8 +910,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "soundex"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_soundex>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_soundex>(thd, this); }
 };
 
 
@@ -924,8 +924,8 @@ public:
   String *val_str(String *str);
   void fix_length_and_dec();
   const char *func_name() const { return "elt"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_elt>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_elt>(thd, this); }
 };
 
 
@@ -938,8 +938,8 @@ public:
   String *val_str(String *str);
   void fix_length_and_dec();
   const char *func_name() const { return "make_set"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_make_set>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_make_set>(thd, this); }
 };
 
 
@@ -955,8 +955,8 @@ public:
   String *val_str_ascii(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "format"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_format>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_format>(thd, this); }
 };
 
 
@@ -978,8 +978,8 @@ public:
     max_length= arg_count * 4;
   }
   const char *func_name() const { return "char"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_char>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_char>(thd, this); }
 };
 
 class Item_func_chr :public Item_func_char
@@ -993,8 +993,8 @@ public:
     max_length= 4;
   }
   const char *func_name() const { return "chr"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_chr>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_chr>(thd, this); }
 };
 
 class Item_func_repeat :public Item_str_func
@@ -1006,8 +1006,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "repeat"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_repeat>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_repeat>(thd, this); }
 };
 
 
@@ -1018,8 +1018,8 @@ public:
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "space"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_space>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_space>(thd, this); }
 };
 
 
@@ -1035,8 +1035,8 @@ public:
   {
     return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_binlog_gtid_pos>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_binlog_gtid_pos>(thd, this); }
 };
 
 
@@ -1062,8 +1062,8 @@ public:
     Item_func_pad(thd, arg1, arg2) {}
   String *val_str(String *);
   const char *func_name() const { return "rpad"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_rpad>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_rpad>(thd, this); }
 };
 
 
@@ -1076,8 +1076,8 @@ public:
     Item_func_pad(thd, arg1, arg2) {}
   String *val_str(String *);
   const char *func_name() const { return "lpad"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_lpad>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_lpad>(thd, this); }
 };
 
 
@@ -1094,8 +1094,8 @@ public:
     max_length=64;
     maybe_null= 1;
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_conv>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_conv>(thd, this); }
 };
 
 
@@ -1129,8 +1129,8 @@ public:
     fix_char_length(args[0]->max_length * 2);
     m_arg0_type_handler= args[0]->type_handler();
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_hex>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_hex>(thd, this); }
 };
 
 class Item_func_unhex :public Item_str_func
@@ -1150,8 +1150,8 @@ public:
     decimals=0;
     max_length=(1+args[0]->max_length)/2;
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_unhex>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_unhex>(thd, this); }
 };
 
 
@@ -1182,8 +1182,8 @@ public:
   Item_func_like_range_min(THD *thd, Item *a, Item *b):
     Item_func_like_range(thd, a, b, true) { }
   const char *func_name() const { return "like_range_min"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_like_range_min>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_like_range_min>(thd, this); }
 };
 
 
@@ -1193,8 +1193,8 @@ public:
   Item_func_like_range_max(THD *thd, Item *a, Item *b):
     Item_func_like_range(thd, a, b, false) { }
   const char *func_name() const { return "like_range_max"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_like_range_max>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_like_range_max>(thd, this); }
 };
 #endif
 
@@ -1220,8 +1220,8 @@ public:
   void print(String *str, enum_query_type query_type);
   const char *func_name() const { return "cast_as_binary"; }
   bool need_parentheses_in_default() { return true; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_binary>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_binary>(thd, this); }
 };
 
 
@@ -1242,8 +1242,8 @@ public:
   {
     return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_load_file>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_load_file>(thd, this); }
 };
 
 
@@ -1259,8 +1259,8 @@ class Item_func_export_set: public Item_str_func
   String  *val_str(String *str);
   void fix_length_and_dec();
   const char *func_name() const { return "export_set"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_export_set>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_export_set>(thd, this); }
 };
 
 
@@ -1278,8 +1278,8 @@ public:
                                   2 * collation.collation->mbmaxlen;
     max_length= (uint32) MY_MIN(max_result_length, MAX_BLOB_WIDTH);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_quote>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_quote>(thd, this); }
 };
 
 class Item_func_conv_charset :public Item_str_func
@@ -1362,8 +1362,8 @@ public:
   void fix_length_and_dec();
   const char *func_name() const { return "convert"; }
   void print(String *str, enum_query_type query_type);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_conv_charset>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_conv_charset>(thd, this); }
 };
 
 class Item_func_set_collation :public Item_str_func
@@ -1384,8 +1384,8 @@ public:
     return args[0]->field_for_view_update();
   }
   bool need_parentheses_in_default() { return true; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_set_collation>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_set_collation>(thd, this); }
 };
 
 
@@ -1413,8 +1413,8 @@ public:
     :Item_func_expr_str_metadata(thd, a) { }
   String *val_str(String *);
   const char *func_name() const { return "charset"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_charset>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_charset>(thd, this); }
 };
 
 
@@ -1425,8 +1425,8 @@ public:
     :Item_func_expr_str_metadata(thd, a) {}
   String *val_str(String *);
   const char *func_name() const { return "collation"; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_collation>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_collation>(thd, this); }
 };
 
 
@@ -1460,8 +1460,8 @@ public:
   Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond)
   { return this; }
   void print(String *str, enum_query_type query_type);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_weight_string>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_weight_string>(thd, this); }
 };
 
 class Item_func_crc32 :public Item_long_func
@@ -1475,8 +1475,8 @@ public:
   const char *func_name() const { return "crc32"; }
   void fix_length_and_dec() { max_length=10; }
   longlong val_int();
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_crc32>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_crc32>(thd, this); }
 };
 
 class Item_func_uncompressed_length : public Item_long_func_length
@@ -1488,8 +1488,8 @@ public:
   const char *func_name() const{return "uncompressed_length";}
   void fix_length_and_dec() { max_length=10; maybe_null= true; }
   longlong val_int();
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_uncompressed_length>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_uncompressed_length>(thd, this); }
 };
 
 #ifdef HAVE_COMPRESS
@@ -1507,8 +1507,8 @@ public:
   void fix_length_and_dec(){max_length= (args[0]->max_length*120)/100+12;}
   const char *func_name() const{return "compress";}
   String *val_str(String *) ZLIB_DEPENDED_FUNCTION
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_compress>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_compress>(thd, this); }
 };
 
 class Item_func_uncompress: public Item_str_binary_checksum_func
@@ -1520,8 +1520,8 @@ public:
   void fix_length_and_dec(){ maybe_null= 1; max_length= MAX_BLOB_WIDTH; }
   const char *func_name() const{return "uncompress";}
   String *val_str(String *) ZLIB_DEPENDED_FUNCTION
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_uncompress>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_uncompress>(thd, this); }
 };
 
 
@@ -1541,8 +1541,8 @@ public:
   {
     return mark_unsupported_function(func_name(), "()", arg, VCOL_NON_DETERMINISTIC);
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_uuid>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_uuid>(thd, this); }
 };
 
 
@@ -1564,8 +1564,8 @@ public:
   String *val_str(String *);
   void print(String *str, enum_query_type query_type);
   enum Functype functype() const   { return DYNCOL_FUNC; }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_dyncol_create>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_dyncol_create>(thd, this); }
 };
 
 
@@ -1578,8 +1578,8 @@ public:
   const char *func_name() const{ return "column_add"; }
   String *val_str(String *);
   void print(String *str, enum_query_type query_type);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_dyncol_add>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_dyncol_add>(thd, this); }
 };
 
 class Item_func_dyncol_json: public Item_str_func
@@ -1595,8 +1595,8 @@ public:
     collation.set(&my_charset_bin);
     decimals= 0;
   }
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_dyncol_json>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_dyncol_json>(thd, this); }
 };
 
 /*
@@ -1637,8 +1637,8 @@ public:
   bool get_dyn_value(THD *thd, DYNAMIC_COLUMN_VALUE *val, String *tmp);
   bool get_date(MYSQL_TIME *ltime, ulonglong fuzzydate);
   void print(String *str, enum_query_type query_type);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_dyncol_get>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_dyncol_get>(thd, this); }
 };
 
 
@@ -1649,8 +1649,8 @@ public:
   void fix_length_and_dec() { maybe_null= 1; max_length= MAX_BLOB_WIDTH; };
   const char *func_name() const{ return "column_list"; }
   String *val_str(String *);
-  Item *get_copy(THD *thd, MEM_ROOT *mem_root)
-  { return get_item_copy<Item_func_dyncol_list>(thd, mem_root, this); }
+  Item *get_copy(THD *thd)
+  { return get_item_copy<Item_func_dyncol_list>(thd, this); }
 };
 
 #endif /* ITEM_STRFUNC_INCLUDED */