tustvold opened a new pull request, #1937:
URL: https://github.com/apache/arrow-rs/pull/1937
# Which issue does this PR close?
Closes #1932
# Rationale for this change
Prior to
https://github.com/apache/arrow-rs/pull/1682/files#diff-103f6c92559ee00d93eff806b411e0c8c8d249564fb3f8674da1da7693f86cb1L393
the writer would set `is_adjusted_to_u_t_c` to true if any timezone was
present in the arrow datatype. This was incorrect as normalization to UTC would
never actually occur.
The fix was to always set `is_adjusted_to_u_t_c` to be false, which whilst
correct, is overly conservative and represents a regression for the case where
the timezone actually is UTC.
# What changes are included in this PR?
If the source array is already normalized to UTC, set `is_adjusted_to_u_t_c`
to be true
# Are there any user-facing changes?
Yes, not sure if counts as breaking though
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