Renamed Type_all_attributes::set_maybe_null() to set_type_maybe_null()

This was done to have Item::set_maybe_null() as an inline function

plugin/type_inet/sql_type_inet.h

@@ -736,7 +736,7 @@ class Type_handler_inet6: public Type_handler
     {
       if (Inet6::fix_fields_maybe_null_on_conversion_to_inet6(items[i]))
       {
-        attr->set_maybe_null(true);
+        attr->set_type_maybe_null(true);
         break;
       }
     }

sql/item.h

@@ -1158,6 +1158,11 @@ class Item :public Value_source,
   }
   const TYPELIB *get_typelib() const { return NULL; }
   void set_maybe_null(bool maybe_null_arg) { maybe_null= maybe_null_arg; }
+  /* This is used when calling Type_all_attributes::set_type_maybe_null() */
+  void set_type_maybe_null(bool maybe_null_arg) override
+  {
+    set_maybe_null(maybe_null_arg);
+  }
   void set_typelib(const TYPELIB *typelib)
   {
     // Non-field Items (e.g. hybrid functions) never have ENUM/SET types yet.

sql/sql_class.h

@@ -7578,7 +7578,7 @@ class Type_holder: public Sql_alloc,
     m_maybe_null(false)
   { }
 
-  void set_maybe_null(bool maybe_null_arg) { m_maybe_null= maybe_null_arg; }
+  void set_type_maybe_null(bool maybe_null_arg) { m_maybe_null= maybe_null_arg; }
   bool get_maybe_null() const { return m_maybe_null; }
 
   decimal_digits_t decimal_precision() const

sql/sql_type.h

@@ -3306,7 +3306,7 @@ class Type_all_attributes: public Type_std_attributes
    :Type_std_attributes(other)
   { }
   virtual ~Type_all_attributes() {}
-  virtual void set_maybe_null(bool maybe_null_arg)= 0;
+  virtual void set_type_maybe_null(bool maybe_null_arg)= 0;
   // Returns total number of decimal digits
   virtual decimal_digits_t decimal_precision() const= 0;
   virtual const TYPELIB *get_typelib() const= 0;

sql/sql_type_geom.cc

@@ -501,7 +501,7 @@ bool Type_handler_geometry::
   func->unsigned_flag= false;
   func->decimals= 0;
   func->max_length= (uint32) UINT_MAX32;
-  func->set_maybe_null(true);
+  func->set_type_maybe_null(true);
   return false;
 }