aokolnychyi commented on code in PR #6304:
URL: https://github.com/apache/iceberg/pull/6304#discussion_r1034133132
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core/src/main/java/org/apache/iceberg/util/TableScanUtil.java:
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@@ -151,38 +153,68 @@ public static <T extends PartitionScanTask>
List<ScanTaskGroup<T>> planTaskGroup
Function<T, Long> weightFunc =
task -> Math.max(task.sizeBytes(), task.filesCount() * openFileCost);
- Map<Integer, StructProjection> projectionsBySpec = Maps.newHashMap();
+ Map<Integer, StructProjection> groupingKeyProjectionsBySpec =
Maps.newHashMap();
- // Group tasks by their partition values
- StructLikeMap<List<T>> tasksByPartition =
StructLikeMap.create(projectedPartitionType);
+ // group tasks by grouping keys derived from their partition tuples
+ StructLikeMap<List<T>> tasksByGroupingKey =
StructLikeMap.create(groupingKeyType);
for (T task : tasks) {
PartitionSpec spec = task.spec();
- StructProjection projectedStruct =
- projectionsBySpec.computeIfAbsent(
+ StructProjection groupingKeyProjection =
+ groupingKeyProjectionsBySpec.computeIfAbsent(
spec.specId(),
- specId -> StructProjection.create(spec.partitionType(),
projectedPartitionType));
- List<T> taskList =
- tasksByPartition.computeIfAbsent(
- projectedStruct.copyFor(task.partition()), k ->
Lists.newArrayList());
Review Comment:
We were using `StructProjection` that lazily projects values. However, it is
not serializable. That's why I can't pass it into task groups. Instead of
creating a copy of the projection, I eagerly project values into
`PartitionData`.
See `projectGroupingKey` below.
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