GIS update get_copy overrides to do_get_copy const

sql/item_geofunc.h

@@ -996,7 +996,7 @@ class Item_func_simplify: public Item_geometry_func_args_geometry
   {
     return &type_handler_geometry;
   }
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_simplify>(thd, this); }
 };
 
@@ -1042,7 +1042,7 @@ class Item_func_isvalid: public Item_long_func_args_geometry
     static LEX_CSTRING name= {STRING_WITH_LEN("st_isvalid") };
     return name;
   }
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_isvalid>(thd, this); }
 };
 
@@ -1062,7 +1062,7 @@ class Item_func_validate: public Item_geometry_func_args_geometry
   {
     return &type_handler_point;
   }
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_validate>(thd, this); }
 };
 
@@ -1347,7 +1347,7 @@ class Item_func_latfromgeohash: public Item_func_latlongfromgeohash
     static LEX_CSTRING name= {STRING_WITH_LEN("st_latfromgeohash") };
     return name;
   }
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_latfromgeohash>(thd, this); }
 };
 
@@ -1362,7 +1362,7 @@ class Item_func_longfromgeohash: public Item_func_latlongfromgeohash
     static LEX_CSTRING name= {STRING_WITH_LEN("st_longfromgeohash") };
     return name;
   }
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_longfromgeohash>(thd, this); }
 };
 
@@ -1382,7 +1382,7 @@ class Item_func_pointfromgeohash: public Item_geometry_func
     return name;
   }
   String *val_str(String *) override;
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_pointfromgeohash>(thd, this); }
 };
 

sql/item_sum.h

@@ -2166,7 +2166,7 @@ class Item_func_collect :public Item_sum_int // XXX why *int* ???
     return { STRING_WITH_LEN("st_collect(") };
   }
   Item *copy_or_same(THD* thd) override;
-  Item *get_copy(THD *thd) override
+  Item *do_get_copy(THD *thd) const override
   { return get_item_copy<Item_func_collect>(thd, this); }
 
   bool supports_removal() const override