pvary commented on code in PR #10935:
URL: https://github.com/apache/iceberg/pull/10935#discussion_r1758196928
##########
core/src/main/java/org/apache/iceberg/BaseIncrementalChangelogScan.java:
##########
@@ -63,33 +60,43 @@ protected CloseableIterable<ChangelogScanTask> doPlanFiles(
return CloseableIterable.empty();
}
- Set<Long> changelogSnapshotIds = toSnapshotIds(changelogSnapshots);
+ Map<Long, Integer> snapshotOrdinals =
computeSnapshotOrdinals(changelogSnapshots);
- Set<ManifestFile> newDataManifests =
- FluentIterable.from(changelogSnapshots)
- .transformAndConcat(snapshot ->
snapshot.dataManifests(table().io()))
- .filter(manifest ->
changelogSnapshotIds.contains(manifest.snapshotId()))
- .toSet();
-
- ManifestGroup manifestGroup =
- new ManifestGroup(table().io(), newDataManifests, ImmutableList.of())
- .specsById(table().specs())
- .caseSensitive(isCaseSensitive())
- .select(scanColumns())
- .filterData(filter())
- .filterManifestEntries(entry ->
changelogSnapshotIds.contains(entry.snapshotId()))
- .ignoreExisting()
- .columnsToKeepStats(columnsToKeepStats());
-
- if (shouldIgnoreResiduals()) {
- manifestGroup = manifestGroup.ignoreResiduals();
- }
-
- if (newDataManifests.size() > 1 && shouldPlanWithExecutor()) {
- manifestGroup = manifestGroup.planWith(planExecutor());
- }
+ // map of delete file to the snapshot where the delete file is added
+ // the delete file is keyed by its path, and the snapshot is represented
by the snapshot ordinal
+ Map<String, Integer> deleteFileToSnapshotOrdinal =
+ computeDeleteFileToSnapshotOrdinal(changelogSnapshots,
snapshotOrdinals);
- return manifestGroup.plan(new
CreateDataFileChangeTasks(changelogSnapshots));
+ Iterable<CloseableIterable<ChangelogScanTask>> plans =
+ FluentIterable.from(changelogSnapshots)
+ .transform(
+ snapshot -> {
+ List<ManifestFile> dataManifests =
snapshot.dataManifests(table().io());
+ List<ManifestFile> deleteManifests =
snapshot.deleteManifests(table().io());
+
+ ManifestGroup manifestGroup =
+ new ManifestGroup(table().io(), dataManifests,
deleteManifests)
+ .specsById(table().specs())
+ .caseSensitive(isCaseSensitive())
+ .select(scanColumns())
+ .filterData(filter())
+ .columnsToKeepStats(columnsToKeepStats());
+
+ if (shouldIgnoreResiduals()) {
+ manifestGroup = manifestGroup.ignoreResiduals();
+ }
+
+ if (dataManifests.size() > 1 && shouldPlanWithExecutor()) {
Review Comment:
I am concerned about a situation when there is no new data files in a
snapshot.
Let's say, we only delete a single row with either a positional or equality
delete. How do we handle this situation? Especially when we have multiple of
these delete files, but no data files at all?
Thanks for your commitment and efforts. Great to see this feature
progressing!
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