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HashProbe.cpp
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HashProbe.cpp
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "velox/exec/HashProbe.h"
#include "velox/common/base/Counters.h"
#include "velox/common/base/StatsReporter.h"
#include "velox/common/testutil/TestValue.h"
#include "velox/exec/OperatorUtils.h"
#include "velox/exec/Task.h"
#include "velox/expression/FieldReference.h"
using facebook::velox::common::testutil::TestValue;
namespace facebook::velox::exec {
namespace {
// Batch size used when iterating the row container.
constexpr int kBatchSize = 1024;
// Returns the type for the hash table row. Build side keys first,
// then dependent build side columns.
RowTypePtr makeTableType(
const RowType* type,
const std::vector<std::shared_ptr<const core::FieldAccessTypedExpr>>&
keys) {
std::vector<std::string> names;
std::vector<TypePtr> types;
std::unordered_set<column_index_t> keyChannels(keys.size());
names.reserve(type->size());
types.reserve(type->size());
for (const auto& key : keys) {
auto channel = type->getChildIdx(key->name());
names.emplace_back(type->nameOf(channel));
types.emplace_back(type->childAt(channel));
keyChannels.insert(channel);
}
for (auto i = 0; i < type->size(); ++i) {
if (keyChannels.find(i) == keyChannels.end()) {
names.emplace_back(type->nameOf(i));
types.emplace_back(type->childAt(i));
}
}
return ROW(std::move(names), std::move(types));
}
// Copy values from 'rows' of 'table' according to 'projections' in
// 'result'. Reuses 'result' children where possible.
void extractColumns(
BaseHashTable* table,
folly::Range<char**> rows,
folly::Range<const IdentityProjection*> projections,
memory::MemoryPool* pool,
const std::vector<TypePtr>& resultTypes,
std::vector<VectorPtr>& resultVectors) {
VELOX_CHECK_EQ(resultTypes.size(), resultVectors.size())
for (auto projection : projections) {
const auto resultChannel = projection.outputChannel;
VELOX_CHECK_LT(resultChannel, resultVectors.size())
auto& child = resultVectors[resultChannel];
// TODO: Consider reuse of complex types.
if (!child || !BaseVector::isVectorWritable(child) ||
!child->isFlatEncoding()) {
child = BaseVector::create(resultTypes[resultChannel], rows.size(), pool);
}
child->resize(rows.size());
table->rows()->extractColumn(
rows.data(), rows.size(), projection.inputChannel, child);
}
}
BlockingReason fromStateToBlockingReason(ProbeOperatorState state) {
switch (state) {
case ProbeOperatorState::kRunning:
[[fallthrough]];
case ProbeOperatorState::kFinish:
return BlockingReason::kNotBlocked;
case ProbeOperatorState::kWaitForBuild:
return BlockingReason::kWaitForJoinBuild;
case ProbeOperatorState::kWaitForPeers:
return BlockingReason::kWaitForJoinProbe;
default:
VELOX_UNREACHABLE("Unexpected state: ", probeOperatorStateName(state));
}
}
// Generate partition number set from spill partition id set.
SpillPartitionNumSet toPartitionNumSet(
const SpillPartitionIdSet& partitionIdSet) {
SpillPartitionNumSet partitionNumSet;
partitionNumSet.reserve(partitionIdSet.size());
for (const auto& partitionId : partitionIdSet) {
partitionNumSet.insert(partitionId.partitionNumber());
}
return partitionNumSet;
}
} // namespace
HashProbe::HashProbe(
int32_t operatorId,
DriverCtx* driverCtx,
const std::shared_ptr<const core::HashJoinNode>& joinNode)
: Operator(
driverCtx,
joinNode->outputType(),
operatorId,
joinNode->id(),
"HashProbe",
joinNode->canSpill(driverCtx->queryConfig())
? driverCtx->makeSpillConfig(operatorId)
: std::nullopt),
outputBatchSize_{outputBatchRows()},
joinNode_(std::move(joinNode)),
joinType_{joinNode_->joinType()},
nullAware_{joinNode_->isNullAware()},
probeType_(joinNode_->sources()[0]->outputType()),
joinBridge_(operatorCtx_->task()->getHashJoinBridgeLocked(
operatorCtx_->driverCtx()->splitGroupId,
planNodeId())),
filterResult_(1),
outputTableRows_(outputBatchSize_) {
VELOX_CHECK_NOT_NULL(joinBridge_);
}
void HashProbe::initialize() {
Operator::initialize();
VELOX_CHECK(hashers_.empty());
hashers_ = createVectorHashers(probeType_, joinNode_->leftKeys());
const auto numKeys = hashers_.size();
keyChannels_.reserve(numKeys);
for (auto& hasher : hashers_) {
keyChannels_.push_back(hasher->channel());
}
VELOX_CHECK_NULL(lookup_);
lookup_ = std::make_unique<HashLookup>(hashers_);
auto buildType = joinNode_->sources()[1]->outputType();
auto tableType = makeTableType(buildType.get(), joinNode_->rightKeys());
if (joinNode_->filter()) {
initializeFilter(joinNode_->filter(), probeType_, tableType);
}
size_t numIdentityProjections = 0;
for (auto i = 0; i < probeType_->size(); ++i) {
auto name = probeType_->nameOf(i);
auto outIndex = outputType_->getChildIdxIfExists(name);
if (outIndex.has_value()) {
projectedInputColumns_.insert(i);
identityProjections_.emplace_back(i, outIndex.value());
if (outIndex.value() == i) {
++numIdentityProjections;
}
}
}
for (column_index_t i = 0; i < outputType_->size(); ++i) {
auto tableChannel = tableType->getChildIdxIfExists(outputType_->nameOf(i));
if (tableChannel.has_value()) {
tableOutputProjections_.emplace_back(tableChannel.value(), i);
}
}
if (numIdentityProjections == probeType_->size() &&
tableOutputProjections_.empty()) {
isIdentityProjection_ = true;
}
if (nullAware_) {
filterTableResult_.resize(1);
}
}
void HashProbe::initializeFilter(
const core::TypedExprPtr& filter,
const RowTypePtr& probeType,
const RowTypePtr& tableType) {
std::vector<core::TypedExprPtr> filters = {filter};
filter_ =
std::make_unique<ExprSet>(std::move(filters), operatorCtx_->execCtx());
column_index_t filterChannel = 0;
std::vector<std::string> names;
std::vector<TypePtr> types;
auto numFields = filter_->expr(0)->distinctFields().size();
names.reserve(numFields);
types.reserve(numFields);
for (auto& field : filter_->expr(0)->distinctFields()) {
const auto& name = field->field();
auto channel = probeType->getChildIdxIfExists(name);
if (channel.has_value()) {
auto channelValue = channel.value();
filterInputProjections_.emplace_back(channelValue, filterChannel++);
names.emplace_back(probeType->nameOf(channelValue));
types.emplace_back(probeType->childAt(channelValue));
continue;
}
channel = tableType->getChildIdxIfExists(name);
if (channel.has_value()) {
auto channelValue = channel.value();
filterTableProjections_.emplace_back(channelValue, filterChannel);
names.emplace_back(tableType->nameOf(channelValue));
types.emplace_back(tableType->childAt(channelValue));
++filterChannel;
continue;
}
VELOX_FAIL(
"Join filter field {} not in probe or build input", field->toString());
}
filterInputType_ = ROW(std::move(names), std::move(types));
}
void HashProbe::maybeSetupInputSpiller(
const SpillPartitionIdSet& spillPartitionIds) {
VELOX_CHECK_NULL(inputSpiller_);
VELOX_CHECK(spillInputPartitionIds_.empty());
spillInputPartitionIds_ = spillPartitionIds;
if (spillInputPartitionIds_.empty()) {
return;
}
// If 'spillInputPartitionIds_' is not empty, then we set up a spiller to
// spill the incoming probe inputs.
inputSpiller_ = std::make_unique<Spiller>(
Spiller::Type::kHashJoinProbe,
probeType_,
HashBitRange(
spillInputPartitionIds_.begin()->partitionBitOffset(),
spillInputPartitionIds_.begin()->partitionBitOffset() +
spillConfig()->numPartitionBits),
spillConfig(),
&spillStats_);
// Set the spill partitions to the corresponding ones at the build side. The
// hash probe operator itself won't trigger any spilling.
inputSpiller_->setPartitionsSpilled(
toPartitionNumSet(spillInputPartitionIds_));
spillHashFunction_ = std::make_unique<HashPartitionFunction>(
inputSpiller_->hashBits(), probeType_, keyChannels_);
spillInputIndicesBuffers_.resize(spillHashFunction_->numPartitions());
rawSpillInputIndicesBuffers_.resize(spillHashFunction_->numPartitions());
numSpillInputs_.resize(spillHashFunction_->numPartitions(), 0);
// If we have received no more input signal from either source or restored
// spill input, then we shall just finish the spiller and records the spilled
// partition set accordingly.
if (noMoreSpillInput_) {
inputSpiller_->finishSpill(spillPartitionSet_);
}
}
void HashProbe::maybeSetupSpillInputReader(
const std::optional<SpillPartitionId>& restoredPartitionId) {
VELOX_CHECK_NULL(spillInputReader_);
if (!restoredPartitionId.has_value()) {
return;
}
// If 'restoredPartitionId' is not null, then 'table_' is built from the
// spilled build data. Create an unsorted reader to read the probe inputs from
// the corresponding spilled probe partition on disk.
auto iter = spillPartitionSet_.find(restoredPartitionId.value());
VELOX_CHECK(iter != spillPartitionSet_.end());
auto partition = std::move(iter->second);
VELOX_CHECK_EQ(partition->id(), restoredPartitionId.value());
spillInputReader_ = partition->createUnorderedReader(
spillConfig_->readBufferSize, pool(), &spillStats_);
spillPartitionSet_.erase(iter);
}
void HashProbe::asyncWaitForHashTable() {
checkRunning();
VELOX_CHECK_NULL(table_);
auto hashBuildResult = joinBridge_->tableOrFuture(&future_);
if (!hashBuildResult.has_value()) {
VELOX_CHECK(future_.valid());
pool()->release();
setState(ProbeOperatorState::kWaitForBuild);
return;
}
if (hashBuildResult->hasNullKeys) {
VELOX_CHECK(nullAware_);
if (isAntiJoin(joinType_) && !joinNode_->filter()) {
// Null-aware anti join with null keys on the build side without a filter
// always returns nothing.
// The flag must be set on the first (and only) built 'table_'.
VELOX_CHECK(spillPartitionSet_.empty());
noMoreInput();
return;
}
buildSideHasNullKeys_ = true;
}
table_ = std::move(hashBuildResult->table);
VELOX_CHECK_NOT_NULL(table_);
maybeSetupSpillInputReader(hashBuildResult->restoredPartitionId);
maybeSetupInputSpiller(hashBuildResult->spillPartitionIds);
prepareTableSpill(hashBuildResult->restoredPartitionId);
if (table_->numDistinct() == 0) {
if (skipProbeOnEmptyBuild()) {
if (!needSpillInput()) {
if (isSpillInput() ||
operatorCtx_->driverCtx()
->queryConfig()
.hashProbeFinishEarlyOnEmptyBuild()) {
noMoreInput();
} else {
skipInput_ = true;
}
}
}
} else if (
(isInnerJoin(joinType_) || isLeftSemiFilterJoin(joinType_) ||
isRightSemiFilterJoin(joinType_) || isRightSemiProjectJoin(joinType_)) &&
table_->hashMode() != BaseHashTable::HashMode::kHash && !isSpillInput() &&
!hasMoreSpillData()) {
// Find out whether there are any upstream operators that can accept dynamic
// filters on all or a subset of the join keys. Create dynamic filters to
// push down.
//
// NOTE: this optimization is not applied in the following cases: (1) if the
// probe input is read from spilled data and there is no upstream operators
// involved; (2) if there is spill data to restore, then we can't filter
// probe inputs solely based on the current table's join keys.
const auto& buildHashers = table_->hashers();
const auto channels = operatorCtx_->driverCtx()->driver->canPushdownFilters(
this, keyChannels_);
// Null aware Right Semi Project join needs to know whether there are any
// nulls on the probe side. Hence, cannot filter these out.
const auto nullAllowed = isRightSemiProjectJoin(joinType_) && nullAware_;
for (auto i = 0; i < keyChannels_.size(); ++i) {
if (channels.find(keyChannels_[i]) != channels.end()) {
if (auto filter = buildHashers[i]->getFilter(nullAllowed)) {
dynamicFilters_.emplace(keyChannels_[i], std::move(filter));
}
}
}
hasGeneratedDynamicFilters_ = !dynamicFilters_.empty();
}
}
bool HashProbe::isSpillInput() const {
return spillInputReader_ != nullptr;
}
void HashProbe::prepareForSpillRestore() {
checkRunning();
VELOX_CHECK(spillEnabled());
VELOX_CHECK(hasMoreSpillData());
// Reset the internal states which are relevant to the previous probe run.
noMoreSpillInput_ = false;
if (lastProber_) {
table_->clear(true);
}
table_.reset();
inputSpiller_.reset();
spillInputReader_.reset();
spillInputPartitionIds_.clear();
spillOutputReader_.reset();
lastProbeIterator_.reset();
VELOX_CHECK(promises_.empty() || lastProber_);
if (!lastProber_) {
return;
}
// Notify the hash build operators to build the next hash table.
joinBridge_->probeFinished();
wakeupPeerOperators();
lastProber_ = false;
}
void HashProbe::wakeupPeerOperators() {
VELOX_CHECK(lastProber_);
auto promises = std::move(promises_);
for (auto& promise : promises) {
promise.setValue();
}
}
std::vector<HashProbe*> HashProbe::findPeerOperators() {
auto task = operatorCtx_->task();
const std::vector<Operator*> operators =
task->findPeerOperators(operatorCtx_->driverCtx()->pipelineId, this);
std::vector<HashProbe*> probeOps;
probeOps.reserve(operators.size());
for (auto* op : operators) {
auto* probeOp = dynamic_cast<HashProbe*>(op);
probeOps.push_back(probeOp);
}
return probeOps;
}
void HashProbe::addSpillInput() {
checkRunning();
if (input_ != nullptr || noMoreSpillInput_) {
return;
}
if (FOLLY_UNLIKELY(!spillInputReader_->nextBatch(input_))) {
noMoreInputInternal();
return;
}
addInput(std::move(input_));
}
void HashProbe::spillInput(RowVectorPtr& input) {
VELOX_CHECK(needSpillInput());
const auto numInput = input->size();
prepareInputIndicesBuffers(
input->size(), inputSpiller_->state().spilledPartitionSet());
const auto singlePartition =
spillHashFunction_->partition(*input, spillPartitions_);
vector_size_t numNonSpillingInput = 0;
for (auto row = 0; row < numInput; ++row) {
const auto partition = singlePartition.has_value() ? singlePartition.value()
: spillPartitions_[row];
if (!inputSpiller_->isSpilled(partition)) {
rawNonSpillInputIndicesBuffer_[numNonSpillingInput++] = row;
continue;
}
rawSpillInputIndicesBuffers_[partition][numSpillInputs_[partition]++] = row;
}
if (numNonSpillingInput == numInput) {
return;
}
// Ensure vector are lazy loaded before spilling.
for (int32_t i = 0; i < input->childrenSize(); ++i) {
input->childAt(i)->loadedVector();
}
for (int32_t partition = 0; partition < numSpillInputs_.size(); ++partition) {
const auto numSpillInputs = numSpillInputs_[partition];
if (numSpillInputs == 0) {
continue;
}
VELOX_CHECK(inputSpiller_->isSpilled(partition));
inputSpiller_->spill(
partition,
wrap(numSpillInputs, spillInputIndicesBuffers_[partition], input));
}
if (numNonSpillingInput == 0) {
input = nullptr;
} else {
input = wrap(numNonSpillingInput, nonSpillInputIndicesBuffer_, input);
}
}
void HashProbe::prepareInputIndicesBuffers(
vector_size_t numInput,
const folly::F14FastSet<uint32_t>& spillPartitions) {
VELOX_DCHECK(spillEnabled());
const auto maxIndicesBufferBytes = numInput * sizeof(vector_size_t);
if (nonSpillInputIndicesBuffer_ == nullptr ||
!nonSpillInputIndicesBuffer_->isMutable() ||
nonSpillInputIndicesBuffer_->size() < maxIndicesBufferBytes) {
nonSpillInputIndicesBuffer_ = allocateIndices(numInput, pool());
rawNonSpillInputIndicesBuffer_ =
nonSpillInputIndicesBuffer_->asMutable<vector_size_t>();
}
for (const auto& partition : spillPartitions) {
if (spillInputIndicesBuffers_[partition] == nullptr ||
spillInputIndicesBuffers_[partition]->size() < maxIndicesBufferBytes) {
spillInputIndicesBuffers_[partition] = allocateIndices(numInput, pool());
rawSpillInputIndicesBuffers_[partition] =
spillInputIndicesBuffers_[partition]->asMutable<vector_size_t>();
}
}
std::fill(numSpillInputs_.begin(), numSpillInputs_.end(), 0);
}
BlockingReason HashProbe::isBlocked(ContinueFuture* future) {
switch (state_) {
case ProbeOperatorState::kWaitForBuild:
VELOX_CHECK_NULL(table_);
if (!future_.valid()) {
setRunning();
asyncWaitForHashTable();
}
break;
case ProbeOperatorState::kRunning:
VELOX_CHECK_NOT_NULL(table_);
if (spillInputReader_ != nullptr) {
addSpillInput();
}
break;
case ProbeOperatorState::kWaitForPeers:
VELOX_CHECK(spillEnabled());
if (!future_.valid()) {
setRunning();
}
break;
case ProbeOperatorState::kFinish:
break;
default:
VELOX_UNREACHABLE(probeOperatorStateName(state_));
break;
}
if (future_.valid()) {
VELOX_CHECK(!isRunning());
*future = std::move(future_);
}
return fromStateToBlockingReason(state_);
}
void HashProbe::clearDynamicFilters() {
// The join can be completely replaced with a pushed down filter when the
// following conditions are met:
// * hash table has a single key with unique values,
// * build side has no dependent columns.
if (keyChannels_.size() == 1 && !table_->hasDuplicateKeys() &&
tableOutputProjections_.empty() && !filter_ && !dynamicFilters_.empty()) {
canReplaceWithDynamicFilter_ = true;
}
Operator::clearDynamicFilters();
}
void HashProbe::decodeAndDetectNonNullKeys() {
nonNullInputRows_.resize(input_->size());
nonNullInputRows_.setAll();
for (auto i = 0; i < hashers_.size(); ++i) {
auto key = input_->childAt(hashers_[i]->channel())->loadedVector();
hashers_[i]->decode(*key, nonNullInputRows_);
}
deselectRowsWithNulls(hashers_, nonNullInputRows_);
if (isRightSemiProjectJoin(joinType_) &&
nonNullInputRows_.countSelected() < input_->size()) {
probeSideHasNullKeys_ = true;
}
}
void HashProbe::addInput(RowVectorPtr input) {
if (skipInput_) {
VELOX_CHECK_NULL(input_);
return;
}
input_ = std::move(input);
// Reset passingInputRowsInitialized_ as input_ as changed.
passingInputRowsInitialized_ = false;
const auto numInput = input_->size();
if (numInput > 0) {
noInput_ = false;
}
if (canReplaceWithDynamicFilter_) {
replacedWithDynamicFilter_ = true;
return;
}
bool hasDecoded = false;
if (needSpillInput()) {
if (isRightSemiProjectJoin(joinType_) && !probeSideHasNullKeys_) {
decodeAndDetectNonNullKeys();
hasDecoded = true;
}
spillInput(input_);
// Check if all the probe input rows have been spilled.
if (input_ == nullptr) {
return;
}
}
if (table_->numDistinct() == 0) {
if (skipProbeOnEmptyBuild()) {
VELOX_CHECK(needSpillInput());
input_ = nullptr;
return;
}
// Build side is empty. This state is valid only for anti, left and full
// joins.
VELOX_CHECK(joinIncludesMissesFromLeft(joinType_));
if (isLeftSemiProjectJoin(joinType_) ||
(isAntiJoin(joinType_) && filter_)) {
// For anti join with filter and semi project join we need to decode the
// join keys columns to initialize 'nonNullInputRows_'. The anti join
// filter evaluation and semi project join output generation will access
// 'nonNullInputRows_' later.
decodeAndDetectNonNullKeys();
}
return;
}
if (!hasDecoded) {
decodeAndDetectNonNullKeys();
}
activeRows_ = nonNullInputRows_;
// Update statistics for null keys in join operator.
// Updating here means we will report 0 null keys when build side is empty.
// If we want more accurate stats, we will have to decode input vector
// even when not needed. So we tradeoff less accurate stats for more
// performance.
{
auto lockedStats = stats_.wlock();
lockedStats->numNullKeys +=
activeRows_.size() - activeRows_.countSelected();
}
table_->prepareForJoinProbe(*lookup_.get(), input_, activeRows_, false);
if (joinIncludesMissesFromLeft(joinType_)) {
// Make sure to allocate an entry in 'hits' for every input row to allow for
// including rows without a match in the output. Also, make sure to
// initialize all 'hits' to nullptr as HashTable::joinProbe will only
// process activeRows_.
auto& hits = lookup_->hits;
hits.resize(numInput);
std::fill(hits.data(), hits.data() + numInput, nullptr);
if (!lookup_->rows.empty()) {
table_->joinProbe(*lookup_);
}
// Update lookup_->rows to include all input rows, not just
// activeRows_ as we need to include all rows in the output.
auto& rows = lookup_->rows;
rows.resize(numInput);
std::iota(rows.begin(), rows.end(), 0);
} else {
if (lookup_->rows.empty()) {
input_ = nullptr;
return;
}
lookup_->hits.resize(lookup_->rows.back() + 1);
table_->joinProbe(*lookup_);
}
results_.reset(*lookup_);
}
void HashProbe::prepareOutput(vector_size_t size) {
// Try to re-use memory for the output vectors that contain build-side data.
// We expect output vectors containing probe-side data to be null (reset in
// clearIdentityProjectedOutput). BaseVector::prepareForReuse keeps null
// children unmodified and makes non-null (build side) children reusable.
if (output_) {
VectorPtr output = std::move(output_);
BaseVector::prepareForReuse(output, size);
output_ = std::static_pointer_cast<RowVector>(output);
} else {
output_ = BaseVector::create<RowVector>(outputType_, size, pool());
}
}
namespace {
VectorPtr createConstantFalse(vector_size_t size, memory::MemoryPool* pool) {
return std::make_shared<ConstantVector<bool>>(
pool, size, false /*isNull*/, BOOLEAN(), false /*value*/);
}
} // namespace
void HashProbe::fillLeftSemiProjectMatchColumn(vector_size_t size) {
if (emptyBuildSide()) {
// Build side is empty or all rows have null join keys.
if (nullAware_ && buildSideHasNullKeys_) {
matchColumn() = BaseVector::createNullConstant(BOOLEAN(), size, pool());
} else {
matchColumn() = createConstantFalse(size, pool());
}
} else {
auto flatMatch = matchColumn()->as<FlatVector<bool>>();
flatMatch->resize(size);
auto rawValues = flatMatch->mutableRawValues<uint64_t>();
for (auto i = 0; i < size; ++i) {
if (nullAware_) {
// Null-aware join may produce TRUE, FALSE or NULL.
if (filter_) {
if (leftSemiProjectIsNull_.isValid(i)) {
flatMatch->setNull(i, true);
} else {
bool hasMatch = outputTableRows_[i] != nullptr;
bits::setBit(rawValues, i, hasMatch);
}
} else {
if (!nonNullInputRows_.isValid(i)) {
// Probe key is null.
flatMatch->setNull(i, true);
} else {
// Probe key is not null.
bool hasMatch = outputTableRows_[i] != nullptr;
if (!hasMatch && buildSideHasNullKeys_) {
flatMatch->setNull(i, true);
} else {
bits::setBit(rawValues, i, hasMatch);
}
}
}
} else {
bool hasMatch = outputTableRows_[i] != nullptr;
bits::setBit(rawValues, i, hasMatch);
}
}
}
}
void HashProbe::fillOutput(vector_size_t size) {
prepareOutput(size);
for (auto projection : identityProjections_) {
// Load input vector if it is being split into multiple batches. It is not
// safe to wrap unloaded LazyVector into two different dictionaries.
ensureLoadedIfNotAtEnd(projection.inputChannel);
auto inputChild = input_->childAt(projection.inputChannel);
output_->childAt(projection.outputChannel) =
wrapChild(size, outputRowMapping_, inputChild);
}
if (isLeftSemiProjectJoin(joinType_)) {
fillLeftSemiProjectMatchColumn(size);
} else {
extractColumns(
table_.get(),
folly::Range<char**>(outputTableRows_.data(), size),
tableOutputProjections_,
pool(),
outputType_->children(),
output_->children());
}
}
RowVectorPtr HashProbe::getBuildSideOutput() {
outputTableRows_.resize(outputBatchSize_);
int32_t numOut;
if (isRightSemiFilterJoin(joinType_)) {
numOut = table_->listProbedRows(
&lastProbeIterator_,
outputBatchSize_,
RowContainer::kUnlimited,
outputTableRows_.data());
} else if (isRightSemiProjectJoin(joinType_)) {
numOut = table_->listAllRows(
&lastProbeIterator_,
outputBatchSize_,
RowContainer::kUnlimited,
outputTableRows_.data());
} else {
// Must be a right join or full join.
numOut = table_->listNotProbedRows(
&lastProbeIterator_,
outputBatchSize_,
RowContainer::kUnlimited,
outputTableRows_.data());
}
if (numOut == 0) {
return nullptr;
}
prepareOutput(numOut);
// Populate probe-side columns of the output with nulls.
for (auto projection : identityProjections_) {
output_->childAt(projection.outputChannel) = BaseVector::createNullConstant(
outputType_->childAt(projection.outputChannel), numOut, pool());
}
extractColumns(
table_.get(),
folly::Range<char**>(outputTableRows_.data(), numOut),
tableOutputProjections_,
pool(),
outputType_->children(),
output_->children());
if (isRightSemiProjectJoin(joinType_)) {
// Populate 'match' column.
if (noInput_) {
// Probe side is empty. All rows should return 'match = false', even ones
// with a null join key.
matchColumn() = createConstantFalse(numOut, pool());
} else {
table_->rows()->extractProbedFlags(
outputTableRows_.data(),
numOut,
nullAware_,
nullAware_ && probeSideHasNullKeys_,
matchColumn());
}
}
return output_;
}
void HashProbe::clearIdentityProjectedOutput() {
if (!output_ || !output_.unique()) {
return;
}
for (auto& projection : identityProjections_) {
output_->childAt(projection.outputChannel) = nullptr;
}
}
bool HashProbe::needLastProbe() const {
return !skipInput_ && needRightSideJoin(joinType_);
}
bool HashProbe::skipProbeOnEmptyBuild() const {
return isInnerJoin(joinType_) || isLeftSemiFilterJoin(joinType_) ||
isRightJoin(joinType_) || isRightSemiFilterJoin(joinType_) ||
isRightSemiProjectJoin(joinType_);
}
bool HashProbe::spillEnabled() const {
return canSpill() && !operatorCtx_->task()->hasMixedExecutionGroup();
}
bool HashProbe::hasMoreSpillData() const {
VELOX_CHECK(spillPartitionSet_.empty() || spillEnabled());
return !spillPartitionSet_.empty() || needSpillInput();
}
bool HashProbe::needSpillInput() const {
VELOX_CHECK(spillInputPartitionIds_.empty() || spillEnabled());
VELOX_CHECK_EQ(spillInputPartitionIds_.empty(), inputSpiller_ == nullptr);
return !spillInputPartitionIds_.empty();
}
void HashProbe::setState(ProbeOperatorState state) {
checkStateTransition(state);
state_ = state;
}
void HashProbe::checkStateTransition(ProbeOperatorState state) {
VELOX_CHECK_NE(state_, state);
switch (state) {
case ProbeOperatorState::kRunning:
if (!spillEnabled()) {
VELOX_CHECK_EQ(state_, ProbeOperatorState::kWaitForBuild);
} else {
VELOX_CHECK(
state_ == ProbeOperatorState::kWaitForBuild ||
state_ == ProbeOperatorState::kWaitForPeers)
}
break;
case ProbeOperatorState::kWaitForPeers:
VELOX_CHECK(spillEnabled());
[[fallthrough]];
case ProbeOperatorState::kWaitForBuild:
[[fallthrough]];
case ProbeOperatorState::kFinish:
VELOX_CHECK_EQ(state_, ProbeOperatorState::kRunning);
break;
default:
VELOX_UNREACHABLE(probeOperatorStateName(state_));
break;
}
}
RowVectorPtr HashProbe::getOutput() {
return getOutputInternal(/*toSpillOutput=*/false);
}
RowVectorPtr HashProbe::getOutputInternal(bool toSpillOutput) {
if (isFinished()) {
return nullptr;
}
checkRunning();
if (!toSpillOutput) {
// Avoid memory reservation if it is triggered by memory arbitration to
// spill pending output.
ensureOutputFits();
}
if (maybeReadSpillOutput()) {
return output_;
}
clearIdentityProjectedOutput();
if (!input_) {
if (!hasMoreInput()) {
if (needLastProbe() && lastProber_) {
auto output = getBuildSideOutput();
if (output != nullptr) {
return output;
}
}
// NOTE: if getOutputInternal() is called from memory arbitration to spill
// the produced output from pending 'input_', then we should not proceed
// with the rest of procedure, and let the next driver getOutput() call to
// handle the probe finishing process properly.
if (toSpillOutput) {
VELOX_CHECK(memory::underMemoryArbitration());
VELOX_CHECK(canReclaim());
return nullptr;
}
if (hasMoreSpillData()) {
prepareForSpillRestore();
asyncWaitForHashTable();
} else {
if (lastProber_ && spillEnabled()) {
joinBridge_->probeFinished();
wakeupPeerOperators();
}
setState(ProbeOperatorState::kFinish);
}
return nullptr;
}
return nullptr;
}
const auto inputSize = input_->size();
if (replacedWithDynamicFilter_) {
addRuntimeStat("replacedWithDynamicFilterRows", RuntimeCounter(inputSize));
auto output = Operator::fillOutput(inputSize, nullptr);
input_ = nullptr;
return output;
}
const bool isLeftSemiOrAntiJoinNoFilter = !filter_ &&
(isLeftSemiFilterJoin(joinType_) || isLeftSemiProjectJoin(joinType_) ||
isAntiJoin(joinType_));
const bool emptyBuildSide = (table_->numDistinct() == 0);
// Left semi and anti joins are always cardinality reducing, e.g. for a
// given row of input they produce zero or 1 row of output. Therefore, if
// there is no extra filter we can process each batch of input in one go.
auto outputBatchSize = (isLeftSemiOrAntiJoinNoFilter || emptyBuildSide)
? inputSize
: outputBatchSize_;
auto mapping =
initializeRowNumberMapping(outputRowMapping_, outputBatchSize, pool());
outputTableRows_.resize(outputBatchSize);
for (;;) {
int numOut = 0;
if (emptyBuildSide) {
// When build side is empty, anti and left joins return all probe side
// rows, including ones with null join keys.
std::iota(mapping.begin(), mapping.end(), 0);
std::fill(outputTableRows_.begin(), outputTableRows_.end(), nullptr);
numOut = inputSize;
} else if (isAntiJoin(joinType_) && !filter_) {
if (nullAware_) {
// When build side is not empty, anti join without a filter returns
// probe rows with no nulls in the join key and no match in the build
// side.
for (auto i = 0; i < inputSize; ++i) {
if (nonNullInputRows_.isValid(i) &&
(!activeRows_.isValid(i) || !lookup_->hits[i])) {
mapping[numOut] = i;
++numOut;
}
}
} else {
for (auto i = 0; i < inputSize; ++i) {
if (!nonNullInputRows_.isValid(i) ||
(!activeRows_.isValid(i) || !lookup_->hits[i])) {
mapping[numOut] = i;
++numOut;
}
}
}
} else {
numOut = table_->listJoinResults(
results_,
joinIncludesMissesFromLeft(joinType_),
mapping,