tustvold commented on code in PR #6682:
URL: https://github.com/apache/arrow-rs/pull/6682#discussion_r1857458086
##########
object_store/src/aws/precondition.rs:
##########
@@ -118,6 +138,17 @@ pub enum S3ConditionalPut {
/// [HTTP precondition]:
https://datatracker.ietf.org/doc/html/rfc9110#name-preconditions
ETagMatch,
+ /// Like `ETagMatch`, but with support for `PutMode::Create` and not
+ /// `PutMode::Option`.
+ ///
+ /// This is the limited form of conditional put supported by Amazon S3
+ /// as of August 2024 ([announcement]).
+ ///
+ /// Encoded as `etag-put-if-not-exists` ignoring whitespace.
+ ///
+ /// [announcement]:
https://aws.amazon.com/about-aws/whats-new/2024/08/amazon-s3-conditional-writes/
+ ETagPutIfNotExists,
Review Comment:
S3 now supports the full header so I wonder if we need this anymore?
https://github.com/apache/arrow-rs/issues/6799
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