[jira] [Created] (ARROW-3263) Use R sentinel values for missingness in addition to bitmask
Gabriel Becker created ARROW-3263:
Summary: Use R sentinel values for missingness in addition to bitmask
Project: Apache Arrow
Issue Type: Improvement
Reporter: Gabriel Becker
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.
This message was sent by Atlassian JIRA