romainfrancois commented on pull request #10730:
URL: https://github.com/apache/arrow/pull/10730#issuecomment-901905934
I finally settled for a single altrep (template) class for both cases (the
array has no nulls or the array has nulls).
The altrep object uses:
- data1: an external pointer to the Array (well to a shared pointer to the
Array)
- data2: NULL until materialization is needed, then data2 is a standard
(and immutable) R vector with the same data
Materialization is needed when:
- we need the DATAPTR and the Array has nulls
- we need a duplicate
Get_region() does not need to materialize the full vector.
Creating the altrep object does not alter the data to impose the R sentinel.
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