Ilya Tokar

Implement missing functionalty

2

We need to implement combine, filter, where, to_parquet, to_csv, query, mode, TimeDelta (several functions) and TimeDeltaIndex

python -m unittest fails with large number of processes

2

Running `mpiexec -n 4 python -m unittest` on master fails with: ``` =================================================================================== = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = PID 17975 RUNNING AT antsatel03 = EXIT...

The benefit is hard to show in benchmarks, but observing the production environment, this change showed single digit improvement on AMD, and nothing but noise on Intel. Closest approximation is...