Gostgres
Postgres in Go over a short vacation.
Try me out
Simply run go build ./cmd/repl && ./repl to drop into a psql-like shell where you can issue SQL commands to an in-memory database.
Currently this shell pre-loads a number of relations and data (employees, departments, locations, and regions).
$ go build ./cmd/repl && ./repl
gostgres ❯ select * from employees where department_id = 2 order by last_name;
employee_id | first_name | last_name | email | manager_id | department_id
-------------+------------+-----------+--------------------------------+------------+---------------
6 | Timothy | Cornish | timothy.cornish@company.com | 4 | 2
2 | Clayton | Mahaffey | clayton.mahaffey@company.com | 4 | 2
8 | Frederick | McLendon | frederick.mclendon@company.com | 4 | 2
(3 rows)
gostgres ❯ select l.*, r.region_name from locations l join regions r on l.region_id = r.region_id;
location_id | location_name | region_id | region_name
-------------+---------------+-----------+-------------
1 | San Francisco | 1 | NA
2 | Toronto | 1 | NA
3 | New York | 1 | NA
4 | Barcelona | 2 | EMEA
5 | Cape Town | 2 | EMEA
6 | Guangzhou | 2 | EMEA
(6 rows)
Time: 106.244µs
Currently, Gostgres supports SELECT, INSERT, UPDATE, and DELETE to varying degrees.
TODO
-
Tech debt
- Combine limit and offset nodes
- Combine alias and projection nodes (if possible)
- Document internals
-
Short-term
- Support CTEs
- Support builtin functions
- Support DISTINCT (ON)
- Support GROUP BY and HAVING
- Support TRUNCATE
- Support subquery expressions (EXISTS/IN/NOT IN/ANY/SOME/ALL)
- Support row comparisons (IN/NOT IN/ANY/SOME/ALL)
-
Medium-term
- Support default values
- Support check constraints
- Support indexes
- Support inserts on conflict
- Fetch optimization
- Outer joins
- Non-nested-loop joins
-
Long-term
- Write to disk
- Recursive CTEs
- Window queries
- DDL
- Networking
- Multiple clients
- Transactions
- Triggers
- WAL