Ensure that default values are set only for insert statement if user does not provide any values, in case of updating existing values to blank it should be set to null. #5934

Incorporated review comments

web/pgadmin/tools/sqleditor/utils/save_changed_data.py

@@ -120,6 +120,12 @@ def save_changed_data(changed_data, columns_info, conn, command_obj,
                 # Update columns value with columns having
                 # not_null=False and has no default value
                 column_data.update(data)
+                use_default = False
+                if not column_data:
+                    for each_col in columns_info:
+                        if columns_info[each_col]['has_default_val']:
+                            column_data[each_col] = 'set_default'
+                            use_default = True
 
                 sql = render_template(
                     "/".join([command_obj.sql_path, 'insert.sql']),
@@ -131,7 +137,8 @@ def save_changed_data(changed_data, columns_info, conn, command_obj,
                     data_type=column_type,
                     pk_names=pk_names,
                     has_oids=command_obj.has_oids(),
-                    type_cast_required=type_cast_required
+                    type_cast_required=type_cast_required,
+                    use_default=use_default
                 )
 
                 select_sql = render_template(