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Sanjiban SenguptaWeston Pace
f3e09b9b6e4
Sanjiban Sengupta authored and Weston Pace committed adb5b00023b
ARROW-16302: [C++] Null values in partitioning field for FilenamePartitioning

This PR fixes the issue of the partitioning field having null values while using FilenamePartitioning.
For FilenamePartitioning, we should only remove the prefix and thus should not use `StripPrefixAndFilename()`, which will remove the filename too along with the prefix.

Closes #12977 from sanjibansg/fix-FilenamePartitioning

Authored-by: Sanjiban Sengupta <sanjiban.sg@gmail.com>
Signed-off-by: Weston Pace <weston.pace@gmail.com>