ajantha-bhat commented on code in PR #13163:
URL: https://github.com/apache/iceberg/pull/13163#discussion_r2111647311
##########
core/src/main/java/org/apache/iceberg/PartitionStatsHandler.java:
##########
@@ -336,16 +336,29 @@ private static PartitionMap<PartitionStats>
computeStatsDiff(
Sets.newHashSet(
SnapshotUtil.ancestorIdsBetween(
toSnapshot.snapshotId(), fromSnapshot.snapshotId(),
table::snapshot));
- Predicate<ManifestFile> manifestFilePredicate =
- manifestFile -> snapshotIdsRange.contains(manifestFile.snapshotId());
- return computeStats(table, toSnapshot, manifestFilePredicate, true /*
incremental */);
+ return computeStats(table, toSnapshot, snapshotIdsRange);
}
private static PartitionMap<PartitionStats> computeStats(
- Table table, Snapshot snapshot, Predicate<ManifestFile> predicate,
boolean incremental) {
+ Table table, Snapshot snapshot, Set<Long> snapshotIdsRange) {
StructType partitionType = Partitioning.partitionType(table);
- List<ManifestFile> manifests =
-
snapshot.allManifests(table.io()).stream().filter(predicate).collect(Collectors.toList());
+ boolean incremental = !snapshotIdsRange.isEmpty();
+
+ List<ManifestFile> manifests;
+ if (incremental) {
+ // DELETED manifest entries are not carried over to subsequent snapshots.
+ // So, for incremental computation, gather the manifests added by each
snapshot
+ // instead of relying solely on those from the latest snapshot.
+ manifests =
+ snapshotIdsRange.stream()
+ .flatMap(
+ id ->
+ table.snapshot(id).allManifests(table.io()).stream()
+ .filter(file -> file.snapshotId().equals(id)))
+ .collect(Collectors.toList());
Review Comment:
I also checked that if snapshots are expired, we cannot find previous stats
for the table in the caller.
So, it will fallback to full compute.
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