Jefffrey opened a new pull request, #5065:
URL: https://github.com/apache/arrow-rs/pull/5065
# Which issue does this PR close?
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Closes #3774
# Rationale for this change
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Allow users to write JSON with null values for keys, where previous (and
default) is to skip the keys.
# What changes are included in this PR?
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In arrow-json writer mod, new type parameter for `Writer` to configure how
null valued keys (and null arrays) should be handled. Will default to SkipNulls
for backward compatibility.
# Are there any user-facing changes?
Yes
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