rambleraptor commented on code in PR #16394:
URL: https://github.com/apache/iceberg/pull/16394#discussion_r3275541709
##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -2019,6 +2058,50 @@ components:
explode: false
example: "vended-credentials,remote-signing"
+ client-capabilities:
+ name: X-Iceberg-Client-Capabilities
+ in: header
+ description: >
+ This header is a forward-compatibility hint, not a security mechanism.
+ Clients can trivially spoof its value; servers MUST NOT base trust or
+ authorization decisions on it.
+
+
+ Optional signal from the client declaring the set of capabilities that
+ the client SDK supports, as a comma-separated list. This header is
+ sent on every request. The server may use this information to tailor
+ its responses.
+
+
+ Defined capability values:
+
+ - `vended-credentials`: The client supports receiving and using
+ storage credentials vended by the catalog server.
+
+ - `remote-signing`: The client supports delegating request signing
+ to a remote signing service provided by the catalog server.
+
+ - `scan-planning`: The client supports server-side scan planning.
Review Comment:
+1 on the versioning. Especially if we extend the expression language,
clients will not be able to express how much of the expression language they
understand.
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