Dela B

Looks like tests are failing since it's trying to build with mongodb version 3.4.10. Syntax for the $lookup/$let pattern is only available after mongodb version 3.6...

@bmoscon Looks like the Python 3 build is failing for tests/integration/tickstore/test_ts_write.py: test_ts_write_pandas due to column order. The change I made should have no effect on tickstore and it looks like...

Yeah of course. My bad. Just set up my IDE on this machine. Didn't realize that my auto-formatter/checker wasn't turned on.