rdblue commented on code in PR #6622:
URL: https://github.com/apache/iceberg/pull/6622#discussion_r1094814986
##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkScanBuilder.java:
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@@ -158,6 +182,141 @@ public Filter[] pushedFilters() {
return pushedFilters;
}
+ @Override
+ public boolean pushAggregation(Aggregation aggregation) {
+ if (!pushDownAggregate(aggregation)) {
+ return false;
+ }
+
+ AggregateEvaluator aggregateEvaluator;
+ try {
+ List<Expression> aggregates =
+ Arrays.stream(aggregation.aggregateExpressions())
+ .map(agg -> SparkAggregates.convert(agg))
+ .collect(Collectors.toList());
+ aggregateEvaluator = AggregateEvaluator.create(schema, aggregates);
+ } catch (Exception e) {
+ LOG.info("Can't push down aggregates: " + e.getMessage());
+ return false;
+ }
+
+ if
(!metricsModeSupportsAggregatePushDown(aggregateEvaluator.aggregates())) {
+ LOG.info("The MetricsMode doesn't support aggregate push down.");
+ return false;
+ }
+
+ List<ManifestFile> manifests = getSnapshot().allManifests(table.io());
+
+ for (ManifestFile manifest : manifests) {
+ try (ManifestReader<DataFile> reader = ManifestFiles.read(manifest,
table.io())) {
+ for (DataFile dataFile : reader) {
+ aggregateEvaluator.update(dataFile.copy());
+ }
+ } catch (IOException e) {
+ LOG.info("Can't push down aggregates: " + e.getMessage());
+ return false;
+ }
+ }
+
+ Object[] res = aggregateEvaluator.result();
Review Comment:
I think it would be good to check whether the aggregates are non-null and
only return if they are valid. Otherwise, this could return different results
depending on whether stats are present in the file metadata. To avoid that, we
can just detect whether we have a result and abort pushdown if we don't.
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