An SQL database from scratch in Java. Inspired by Cassandra.

Features:

• Uses an LSM Tree to store and persist data (More about LSM trees at https://www.geeksforgeeks.org/introduction-to-log-structured-merge-lsm-tree/)
• Insertion, creation of tables and universal selection ("SELECT * FROM table;") queries are implemented successfully.
• The SQL is parsed using a Parser generated by an ANTLR grammar.

To-Do List:

• Implement specific (filter) selection ("SELECT * FROM TABLE WHERE FIELD = VALUE;")
• Implement compaction of SSTables. Will have multiple ways to compact them.
• Persist the table catalog to disk.