fix polars groupby script to polars==latest#244

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ritchie46 wants to merge 6 commits intoh2oai:masterfrom ritchie46:fix_polars

Commits on Feb 13, 2022

fix polars groupby script to polars==0.13.0
ritchie46
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Commits on Aug 29, 2022

fix for polars > 0.14.0 and improve q8
ritchie46
committed

Commits on Mar 31, 2023