thswlsqls opened a new issue, #17081:
URL: https://github.com/apache/iceberg/issues/17081
**Apache Iceberg version**
main @ 49b89a8c5
**Query engine**
None (Java API)
**Please describe the bug**
The "Replacing and fast forwarding branches and tags" example in
`docs/docs/java-api-quickstart.md` (line 255) calls
`table.manageSnapshots().replaceBranch(tag, 4)` on `tag = "audit-tag"`, a tag
(already used as a tag two examples earlier via `useRef("audit-tag")`).
`UpdateSnapshotReferencesOperation.replaceBranch(String, long)`
(`core/src/main/java/org/apache/iceberg/UpdateSnapshotReferencesOperation.java`
line 99-104) requires the target ref to be a branch
(`Preconditions.checkArgument(ref.isBranch(), "Ref %s is a tag not a branch",
name)`), so calling it on a tag throws `IllegalArgumentException` at runtime.
`ManageSnapshots` already exposes `replaceTag(String, long)`
(`api/src/main/java/org/apache/iceberg/ManageSnapshots.java` line 154) for
exactly this case.
**Steps to reproduce**
Copy the quickstart example as written and run it against a table with an
`audit-tag` tag: the call to `replaceBranch(tag, 4)` throws
`IllegalArgumentException: Ref audit-tag is a tag not a branch`.
**Additional context**
N/A.
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