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DRDB

This project is built for learning purposes and is not intended for production use.

📋 Introduction

DRDB (Datafusion + RocksDB) leverages DataFusion as its SQL engine and RocksDB as the storage backend.

The main goal of this project is to deepen my understanding of DataFusion and database internals. The ultimate objective is to develop a fully functional columnar database.

Please note that this is a personal learning project, and as I'm still exploring, there may be mistakes or inefficiencies in the implementation. Any feedback or suggestions are welcome!

📅 Recent Updates

  • 2024/10/04: Set up the structure to be implemented to support CREATE and DROP SQLs.

  • 2024/09/22: Introduced a customized DeleteExec to perform delete operations on rocksdb, and a series of planners and rule to make datafusion replace the DML::Delete plan, which is not support, to DeletePlanNode.

  • 2024/09/15: Introduced an abstraction layer between RocksDB and DataFusion's TableProvider. Implemented basic scan and insert_into operations to enable reading and writing to RocksDB, currently supporting only DataType::Utf8. Currently ugly code.

👨‍💻 Roadmap

This project is still in its early stages. Here’s what I plan to work on:

  • Implement a serialization layer for converting data between RecordBatch and rocksdb::DB.
  • Extend DataFusion’s DML capabilities to support SQL commands like INSERT INTO and DELETE FROM.
  • Extend DataFusion’s Sql2Rel to handle SQL commands like CREATE TABLE and DROP TABLE.
  • Support different DataTypes, now only DataType::Utf8.
  • Support ALTER TABLE.
  • More...