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I think it would be reasonable to implement an interface to the tidyr package. The implementation would allow to lazily process ArrowTables before put it back into the memory. However, currently you need to collect the table first before applying tidyr methods. The following code chunk shows an example routine:
The main focus might be the following three methods:
tidyr::[un]nest(),
tidyr::pivot_[longer|wider](), and
tidyr::seperate().
I suppose the last two can be fairly quickly implemented, but tidyr::nest() and tidyr::unnest() cannot be implement before conversion to List will be accessible.
Neal Richardson / @nealrichardson:
If you wanted to explore this, one challenge I see is that pivot_longer and pivot_wider aren't generics, so you can't just make arrow methods for them.
Dominic Dennenmoser:
Thanks for refering to that. I've just looked for issues or pull-requests mention anything in that direction. Fortunately, a generic version of pivot_[longer|wider]() will be available in the upcoming version of tidyr, and is already implemented into the development version (#800).
I think it would be reasonable to implement an interface to the
tidyr
package. The implementation would allow to lazily process ArrowTables before put it back into the memory. However, currently you need to collect the table first before applying tidyr methods. The following code chunk shows an example routine:The main focus might be the following three methods:
tidyr::[un]nest()
,tidyr::pivot_[longer|wider]()
, andtidyr::seperate()
.I suppose the last two can be fairly quickly implemented, but
tidyr::nest()
andtidyr::unnest()
cannot be implement before conversion to List will be accessible.Reporter: Dominic Dennenmoser
Note: This issue was originally created as ARROW-8813. Please see the migration documentation for further details.
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