wjones127 opened a new pull request, #3944:
URL: https://github.com/apache/arrow-rs/pull/3944
# Which issue does this PR close?
Closes #478.
# Rationale for this change
Metadata is used in extension types to communicate additional information.
For example, the [geoarrow
specification](https://github.com/geoarrow/geoarrow/blob/main/extension-types.md)
uses field metadata to communicate extension types and coordinate systems for
geospatial arrays.
# What changes are included in this PR?
Adds metadata round tripping for fields and schemas.
# Are there any user-facing changes?
Fields and schemas brought through the C data interface will now have their
metadata preserved.
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