amogh-jahagirdar commented on code in PR #4578:
URL: https://github.com/apache/iceberg/pull/4578#discussion_r867645902
##########
core/src/main/java/org/apache/iceberg/RemoveSnapshots.java:
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@@ -161,21 +173,101 @@ public List<Snapshot> apply() {
private TableMetadata internalApply() {
this.base = ops.refresh();
+ if (base.refs().isEmpty()) {
+ return base;
+ }
Set<Long> idsToRetain = Sets.newHashSet();
- List<Long> ancestorIds = SnapshotUtil.ancestorIds(base.currentSnapshot(),
base::snapshot);
- if (minNumSnapshots >= ancestorIds.size()) {
- idsToRetain.addAll(ancestorIds);
- } else {
- idsToRetain.addAll(ancestorIds.subList(0, minNumSnapshots));
+ // Identify refs that should be removed
+ Set<String> retainedRefs = computeRetainedRefs(base.refs());
+ Set<Long> retainedRefIds = retainedRefs.stream()
+ .map(ref -> base.ref(ref).snapshotId())
+ .collect(Collectors.toSet());
+
+ for (long idToRemove : idsToRemove) {
+ Preconditions.checkArgument(!retainedRefIds.contains(idToRemove),
+ "Cannot expire %s. There is a reference to it", idToRemove);
+ }
+
+ idsToRetain.addAll(retainedRefIds);
+ Set<Long> branchSnapshotsToRetain =
computeAllBranchSnapshotsToRetain(base.refs());
Review Comment:
Updated
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