rdblue commented on code in PR #6622:
URL: https://github.com/apache/iceberg/pull/6622#discussion_r1112401995
##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkScanBuilder.java:
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@@ -158,6 +178,134 @@ public Filter[] pushedFilters() {
return pushedFilters;
}
+ @Override
+ public boolean pushAggregation(Aggregation aggregation) {
+ if (!canPushDownAggregation(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 (UnsupportedOperationException | IllegalArgumentException e) {
+ LOG.info("Skipped aggregate pushdown: " + e);
+ return false;
+ }
+
+ if
(!metricsModeSupportsAggregatePushDown(aggregateEvaluator.aggregates())) {
+ return false;
+ }
+
+ TableScan scan = table.newScan();
+ ((DataTableScan) scan).setStats(true);
+ Snapshot snapshot = readSnapshot();
+ if (snapshot == null) {
+ LOG.info("Skipped aggregate pushdown: table snapshot is null");
+ return false;
+ }
+ scan = scan.useSnapshot(snapshot.snapshotId());
+ scan = configureSplitPlanning(scan);
+
+ try (CloseableIterable<FileScanTask> fileScanTasks = scan.planFiles()) {
Review Comment:
I think that Spark will also push filters first. If we don't intend to pass
filters to the scan, then we will need to detect that there are filters and
return `false` because we don't filter right now.
Also, it is possible to filter as long as the filter is entirely pushed
down. You can check that using `ExpressionUtil.selectsPartitions`. If that
returns true, then it is safe to pass the filter here!
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