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https://issues.apache.org/jira/browse/ARROW-3263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17660286#comment-17660286
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Rok Mihevc commented on ARROW-3263:
-----------------------------------
This issue has been migrated to [issue
#19603|https://github.com/apache/arrow/issues/19603] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [R] Use R sentinel values for missingness in addition to bitmask
> ----------------------------------------------------------------
>
> Key: ARROW-3263
> URL: https://issues.apache.org/jira/browse/ARROW-3263
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format, R
> Reporter: Gabriel Becker
> Priority: Major
>
> R uses sentinal values to indicate missingness within Atomic vectors (read
> arrays in Arrow parlance, AFAIK).
> Currently according to [~wesmckinn], the current value in the array in memory
> is undefined if the bitmap indicating missingness is set to 1.
> This will force R to copy and modify data whenever adopting Arrow data which
> has missingness present as a native vector.
> If the value were written to the relevant sentinal values (INT_MIN for 32 bit
> integers, and NaN with payload 1954 for double precision floats) _in addition
> to_ the bit mask, then R would be able to use Arrow as intended while not
> breaking any other systems.
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