Goals

1. Implement statistics subsystem in the Tarantool core (can be carried over to Q2)
2. Implement distributed aggregates (no custom aggregate functions)
3. Implement a new Picodata engine
4. "Not" support

Results

Most of the goals were unfinished and still are in progress (carried over to Q2). I believe that the engine refactoring (storage runtime now uses tarantool spaces for temporary tables) is the reason of the broken deadlines. We got lots of bugs after this refactoring.

The good news are: we started PG protocol (Q3) and refactored the tree traversal (Q4).