Add Vaex#243

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maartenbreddels wants to merge 6 commits intoh2oai:masterfrom

Commits on Jun 21, 2021

Vaex solution
maartenbreddels
committed

Commits on Jun 30, 2021

refactor the vaex-groupby scipt
JovanVeljanoski
committed

Commits on Jul 7, 2021

Refactor the join-vaex script to make it more readable
JovanVeljanoski
committed

Commits on Feb 9, 2022

Refactor a bit
maartenbreddels
committed

Commits on Feb 11, 2022

refactor to comply with repo standards
JovanVeljanoski
committed

Commits on Feb 15, 2022

small improvements
JovanVeljanoski
committed