github-actions[bot] commented on code in PR #65129:
URL: https://github.com/apache/doris/pull/65129#discussion_r3518177866
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fe/fe-core/src/main/java/org/apache/doris/nereids/properties/RequestPropertyDeriver.java:
##########
@@ -339,14 +340,22 @@ public Void
visitPhysicalSetOperation(PhysicalSetOperation setOperation, PlanCon
// shuffle all column
// TODO: for wide table, may be we should add a upper limit of
shuffle columns
- // TODO: open comment when support `enable_local_shuffle_planner`
and change to REQUIRE
- // intersect/except always need hash distribution, we use REQUIRE
to auto select
- // bucket shuffle or execution shuffle
+ // intersect/except always need hash distribution. Auto-selecting
bucket shuffle
+ // (ShuffleType.REQUIRE) for set operation is only valid when the
FE plans the local
+ // shuffle: with the BE-side local-shuffle planner the backend
cannot infer the
+ // correct local shuffle type for the set sink/probe and computes
wrong results.
+ // It also requires the nereids distribute planner: the legacy
coordinator only
+ // supports bucket-shuffle-partitioned sinks whose dest fragment
contains a bucket
+ // shuffle join. Fall back to EXECUTION_BUCKETED otherwise.
Review Comment:
This still enables bucket-shuffle set operations when
`enable_local_shuffle=false`. The predicate here only checks
`enable_local_shuffle_planner`, and the same predicate is used later when
choosing `DISTRIBUTE_TO_CHILD_INDEX` and marking the translated
`SetOperationNode` as `BUCKET_SHUFFLE`. However
`NereidsPlanner.addLocalExchangeAfterDistribute()` skips the FE local-exchange
pass unless both `enable_local_shuffle_planner` and `enable_local_shuffle` are
true, and BE only plans local shuffle when `enable_local_shuffle` is true and
FE planning is off. So a legal session like `set enable_local_shuffle=false;`
with the planner variable left at its default can still choose a
storage-bucketed set operation, but neither side inserts the bucket/local hash
exchanges that this PR relies on for set sink/probe alignment. Please gate this
path on the same effective condition as the local-exchange pass
(`enable_local_shuffle && enable_local_shuffle_planner &&
canUseNereidsDistributePlanner(...
)`) in request derivation/regulation/translation, and ideally cover the
disabled-local-shuffle case in the regression.
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/properties/ChildOutputPropertyDeriver.java:
##########
@@ -440,53 +443,56 @@ public PhysicalProperties
visitPhysicalSetOperation(PhysicalSetOperation setOper
return PhysicalProperties.GATHER;
}
- // TODO: open comment when support `enable_local_shuffle_planner`
- // int distributeToChildIndex
- // =
setOperation.<Integer>getMutableState(PhysicalSetOperation.DISTRIBUTE_TO_CHILD_INDEX).orElse(-1);
- // if (distributeToChildIndex >= 0
- // && childrenDistribution.get(distributeToChildIndex)
instanceof DistributionSpecHash) {
- // DistributionSpecHash childDistribution
- // = (DistributionSpecHash)
childrenDistribution.get(distributeToChildIndex);
- // List<SlotReference> childToIndex =
setOperation.getRegularChildrenOutputs().get(distributeToChildIndex);
- // Map<ExprId, Integer> idToOutputIndex = new LinkedHashMap<>();
- // for (int j = 0; j < childToIndex.size(); j++) {
- // idToOutputIndex.put(childToIndex.get(j).getExprId(), j);
- // }
- //
- // List<ExprId> orderedShuffledColumns =
childDistribution.getOrderedShuffledColumns();
- // List<ExprId> setOperationDistributeColumnIds = new
ArrayList<>();
- // for (ExprId tableDistributeColumnId : orderedShuffledColumns) {
- // Integer index =
idToOutputIndex.get(tableDistributeColumnId);
- // if (index == null) {
- // break;
- // }
- //
setOperationDistributeColumnIds.add(setOperation.getOutput().get(index).getExprId());
- // }
- // // check whether the set operation output all distribution
columns of the child
- // if (setOperationDistributeColumnIds.size() ==
orderedShuffledColumns.size()) {
- // boolean isUnion = setOperation instanceof Union;
- // boolean shuffleToRight = distributeToChildIndex > 0;
- // if (!isUnion && shuffleToRight) {
- // return new PhysicalProperties(
- // new DistributionSpecHash(
- // setOperationDistributeColumnIds,
- // ShuffleType.EXECUTION_BUCKETED
- // )
- // );
- // } else {
- // // keep the distribution as the child
- // return new PhysicalProperties(
- // new DistributionSpecHash(
- // setOperationDistributeColumnIds,
- // childDistribution.getShuffleType(),
- // childDistribution.getTableId(),
- // childDistribution.getSelectedIndexId(),
- // childDistribution.getPartitionIds()
- // )
- // );
- // }
- // }
- // }
+ // When set-op bucket shuffle is chosen (DISTRIBUTE_TO_CHILD_INDEX is
set by
+ // ChildrenPropertiesRegulator, which only happens under the FE
local-shuffle planner),
+ // the set operation keeps the basic child's bucket distribution as
its own output so the
Review Comment:
This branch depends on `DISTRIBUTE_TO_CHILD_INDEX` being present on the
final `PhysicalSetOperation`, but that value is only mutable planner state.
`chooseBestPlan()` rebuilds the selected node with `withChildren()`,
`withGroupExpression()`, and `withPhysicalPropertiesAndStats()`, and the set-op
`with...` methods only use `copyWithSameId()`, so the selected basic-child
index is not carried onto the final plan. If a later post-processor rewrites
anything, the default-enabled `ShuffleKeyPruner` runs
`RecomputePhysicalPropertiesPostProcessor`, which calls this deriver again and
copies only `KEY_GROUP`; now this branch is skipped and the code falls back to
the old all-children derivation. For a bucket-shuffle set op with a
NATURAL/STORAGE_BUCKETED basic child and STORAGE_BUCKETED enforced children,
that can downgrade the output from the costed bucket hash to
`STORAGE_ANY`/`EXECUTION_BUCKETED`, so an upstream join or aggregate can see a
different distribution contract from the one sele
cted by CBO. Please make the basic-child choice part of the immutable
`PhysicalSetOperation` state copied by all `with...` methods, or recompute the
same choice from child properties, and cover a recompute case with shuffle-key
pruning enabled.
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