Dumb RDBMS for my study

Done

• CREATE DATABASE, CREATE TABLE, INSERT, UPDATE, SELECT, INNER JOIN
• Persist to Disk (Wal and Snapshot)
• Transaction (with OCC)
• Multiple process (goroutine)
• Test

TODO

• Replication (with Raft)
• Persist (Distribution, multiple write in one transaction)
• Multi-tenant (Send tenant-id with SQL and not read other tenant's data)
• Index
• Remove panic
• Abort ambiguous column identifier (SELECT id FROM a, b)