stevenzwu commented on code in PR #16936:
URL: https://github.com/apache/iceberg/pull/16936#discussion_r3457444883
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api/src/main/java/org/apache/iceberg/ManifestFile.java:
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@@ -186,6 +186,26 @@ default boolean hasDeletedFiles() {
/** Returns the total number of rows in all files with status DELETED in the
manifest file. */
Long deletedRowsCount();
+ /**
+ * Returns the number of files with status REPLACED in the manifest file, or
null if not tracked.
+ *
+ * <p>REPLACED files are the prior-state entries of v4 REPLACED/MODIFIED
pairs and are not live.
+ * Returns null for manifest files written by pre-v4 writers.
+ */
+ default Integer replacedFilesCount() {
Review Comment:
Generally, public-interface changes should be minimized and delayed.
Justification for keeping these two on the interface in this PR:
**In-tree consumers** (this PR + close follow-ups):
- `ContentEntryAdapters.manifestInfo()` (this PR) populates the v4 root
manifest's `manifest_info` struct from `manifest.replacedFilesCount()` /
`replacedRowsCount()`.
- `MergingSnapshotProducer.validateAddedDVs` (follow-up phase) filters
concurrent data manifests by `replacedFilesCount > 0` to detect v4 colocated-DV
write conflicts — without it, every concurrent data manifest must be
deep-scanned.
**Convention.** The interface-default pattern matches v3's existing
extensions for spec-defined optional fields on `ManifestFile`: `firstRowId`
(row lineage), `keyMetadata` (encryption), `containsNaN` (partition NaN). v4
spec-defined `manifest_info` counts belong on the same interface in the same
shape.
**A `TrackedFile`-based parallel v4 API was considered.** Would require
rewriting `ManifestGroup` and every engine that consumes `FileScanTask`. The
cost is disproportionate to the savings.
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