Report for week 4: Hello! This week I was able to make INSERT...RETURNING work. It is working fine for simple insert statement, inserting multiple rows in single statement, INSERT...SET and INSERT...ON DUPLICATE KEY UPDATE. It is returning the listed fields, working for alias and operators as well. I was getting segmentation fault when I was working on this. Zulip messages helped to solve that problem by cleaning returning_list by calling returning_list.empty() in mysql_init_select(). I also realised I hadn't called setup_fields(), setup_wild() and checking if there is '*' for returning_list in mysql_prepare_insert() which was also causing this error. Here is a link to the test cases and results for above variants of INSERT...RETURNING: https://github.com/rucha174/server/commit/66f8046d615f97a1078c8eedc3cf11d6e3... As for INSERT...SELECT...RETURNING, I passed lex->field_list instead of returning_list as an argument in prepare(), send_result_set_metadata() and send_data(). It was returning all the fields from the insert table. Then I passed returning_list as the argument and it is returning the listed fields but from the select table. So now I am working on it by looking how select_insert class uses lex->field_list and do the same for returning_list. Here is the link to code which returns the listed fields for select table: https://github.com/rucha174/server/commit/6b18dd3cfc76d41871357c5b2006e04d1d... Regards, Rucha Deodhar