Goals

1. Picodata support (from Q1)
2. Left join
3. PostgreSQL protocol
4. Stress tests in CI
5. Cost-based join optimizations
6. Tables with non-journaled metadata in Tarantool
7. DISTINCT and HAVING
8. "Not" operator (from Q1)

Results

Ok:

1. Picodata support (from Q1)
2. Left join
3. DISTINCT and HAVING

Partial:

1. PostgreSQL protocol (almost done)
2. Stress tests in CI (added a single stress test to CI, then delegated stress test framework to Georgi Lomakin)

Ignored:

1. "Not" operator (from Q1)
2. Tables with non-journaled metadata in Tarantool

Failed:

1. Cost-based join optimizations (a very poor progress on the way to join reorder problem).
2. Documentation