mbrobbel opened a new pull request, #5822:
URL: https://github.com/apache/arrow-rs/pull/5822
# Rationale for this change
It would be nice to better support reading and writing the canonical `uuid`
extension type with the arrow and parquet crate i.e. mapping between the arrow
extension type and the parquet logical `uuid` type.
# What changes are included in this PR?
This adds an `ExtensionType` enum for canonical extension types.
# Are there any user-facing changes?
Users can now annotate their logical types with extension types, and for
`uuid` they are propagated via the arrow writer to map to the parquet `uuid`
logical type.
This needs tests and better docs, but I'd like to get some feedback on the
approach first, because there are many different ways to implement this.
I quickly tested this change with
[narrow](https://github.com/mbrobbel/narrow/pull/183/files#diff-8868964a71a65db2aaef344fc98c97484058a8a9d46dc45d91a9d47313ffe100R21-R26)
and those `uuid` fields (in the parquet file) are now picked up as `uuid`
instead of `blob` by DuckDB.
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