Internal compression filter option using gzip per column
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Description
Compression filter option using gzip per column in (say) jay file. Leads to savings of 10X for disk storage for large data sets.
https://github.com/h2oai/h2oai/issues/6211#issuecomment-476905136
Related code:
https://github.com/h2oai/h2oai/blob/dev/h2oaicore/systemutils.py#L1331-L1384
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