* output parser error

* fix bug

* fix bug

* fix compile

* fix compile bug

* fix bug

* Fix bug in groupby combine with aggregate

* ADD Q4_test4

* fix empty table

* fix bug

* fix cmake

* fix bug

* Implement Aggregate and Groupby Operator.

Co-authored-by: Smile <t202410213993114@eduxiji.net>

* Modify CMakeLists

* Fix seq_scan

* Fix

* Fix close_db

* test

* Fix bug

* Fix bug in system manager

* Revert CMakeLists.txt

* Basic implementation of query engine

* Implement record manager

* Implement buffer manager

* Implement lru_replacer

* Implement disk manager, fix bug, and add clang-format file.

* Initial commit disk manager