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Support reading Iceberg split with equality deletes
This commit introduces EqualityDeleteFileReader, which is used to read Iceberg splits with equality delete files. Co-authored-by: Naveen Kumar Mahadevuni <[email protected]>
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velox/connectors/hive/iceberg/EqualityDeleteFileReader.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. | ||
| */ | ||
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| #include "velox/connectors/hive/iceberg/EqualityDeleteFileReader.h" | ||
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| #include "velox/connectors/hive/HiveConnectorUtil.h" | ||
| #include "velox/connectors/hive/iceberg/FilterUtil.h" | ||
| #include "velox/connectors/hive/iceberg/IcebergDeleteFile.h" | ||
| #include "velox/dwio/common/ReaderFactory.h" | ||
| #include "velox/dwio/common/TypeUtils.h" | ||
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| using namespace facebook::velox::common; | ||
| using namespace facebook::velox::core; | ||
| using namespace facebook::velox::exec; | ||
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| namespace facebook::velox::connector::hive::iceberg { | ||
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| static constexpr const int kMaxBatchRows = 10'000; | ||
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| EqualityDeleteFileReader::EqualityDeleteFileReader( | ||
| const IcebergDeleteFile& deleteFile, | ||
| std::shared_ptr<const dwio::common::TypeWithId> baseFileSchema, | ||
| FileHandleFactory* fileHandleFactory, | ||
| folly::Executor* executor, | ||
| const ConnectorQueryCtx* connectorQueryCtx, | ||
| const std::shared_ptr<const HiveConfig> hiveConfig, | ||
| std::shared_ptr<io::IoStatistics> ioStats, | ||
| dwio::common::RuntimeStatistics& runtimeStats, | ||
| const std::string& connectorId) | ||
| : deleteFile_(deleteFile), | ||
| baseFileSchema_(baseFileSchema), | ||
| connectorQueryCtx_(connectorQueryCtx), | ||
| hiveConfig_(hiveConfig), | ||
| deleteSplit_(nullptr), | ||
| fileHandleFactory_(fileHandleFactory), | ||
| executor_(executor), | ||
| pool_(connectorQueryCtx->memoryPool()), | ||
| ioStats_(ioStats), | ||
| deleteRowReader_(nullptr) { | ||
| VELOX_CHECK(deleteFile_.content == FileContent::kEqualityDeletes); | ||
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| if (deleteFile_.recordCount == 0) { | ||
| return; | ||
| } | ||
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| std::unordered_set<int32_t> equalityFieldIds( | ||
| deleteFile_.equalityFieldIds.begin(), deleteFile_.equalityFieldIds.end()); | ||
| auto deleteFieldSelector = [&equalityFieldIds](size_t index) { | ||
| return equalityFieldIds.find(static_cast<int32_t>(index)) != | ||
| equalityFieldIds.end(); | ||
| }; | ||
| auto deleteFileSchema = dwio::common::typeutils::buildSelectedType( | ||
| baseFileSchema_, deleteFieldSelector); | ||
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| rowType_ = std::static_pointer_cast<const RowType>(deleteFileSchema->type()); | ||
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| // TODO: push down filter if previous delete file contains this one. E.g. | ||
| // previous equality delete file has a=1, and this file also contains | ||
| // columns a, then a!=1 can be pushed as a filter when reading this delete | ||
| // file. | ||
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| auto scanSpec = std::make_shared<common::ScanSpec>("<root>"); | ||
| scanSpec->addAllChildFields(rowType_->asRow()); | ||
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| deleteSplit_ = std::make_shared<HiveConnectorSplit>( | ||
| connectorId, | ||
| deleteFile_.filePath, | ||
| deleteFile_.fileFormat, | ||
| 0, | ||
| deleteFile_.fileSizeInBytes); | ||
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| // Create the Reader and RowReader | ||
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| dwio::common::ReaderOptions deleteReaderOpts(pool_); | ||
| configureReaderOptions( | ||
| deleteReaderOpts, | ||
| hiveConfig_, | ||
| connectorQueryCtx_, | ||
| rowType_, | ||
| deleteSplit_); | ||
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| auto deleteFileHandleCachePtr = | ||
| fileHandleFactory_->generate(deleteFile_.filePath); | ||
| auto deleteFileInput = createBufferedInput( | ||
| *deleteFileHandleCachePtr, | ||
| deleteReaderOpts, | ||
| connectorQueryCtx_, | ||
| ioStats_, | ||
| executor_); | ||
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| auto deleteReader = | ||
| dwio::common::getReaderFactory(deleteReaderOpts.fileFormat()) | ||
| ->createReader(std::move(deleteFileInput), deleteReaderOpts); | ||
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| dwio::common::RowReaderOptions deleteRowReaderOpts; | ||
| configureRowReaderOptions( | ||
| deleteRowReaderOpts, {}, scanSpec, nullptr, rowType_, deleteSplit_); | ||
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| deleteRowReader_.reset(); | ||
| deleteRowReader_ = deleteReader->createRowReader(deleteRowReaderOpts); | ||
| } | ||
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| void EqualityDeleteFileReader::readDeleteValues( | ||
| SubfieldFilters& subfieldFilters, | ||
| std::vector<core::TypedExprPtr>& expressionInputs) { | ||
| VELOX_CHECK(deleteRowReader_); | ||
| VELOX_CHECK(deleteSplit_); | ||
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| if (!deleteValuesOutput_) { | ||
| deleteValuesOutput_ = BaseVector::create(rowType_, 0, pool_); | ||
| } | ||
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| // TODO:: verfiy if the field is a sub-field. Velox currently doesn't support | ||
| // pushing down filters to sub-fields | ||
| if (rowType_->size() == 1) { | ||
| // Construct the IN list filter that can be pushed down to the base file | ||
| // readers, then update the baseFileScanSpec. | ||
| readSingleColumnDeleteValues(subfieldFilters); | ||
| } else { | ||
| readMultipleColumnDeleteValues(expressionInputs); | ||
| } | ||
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| deleteSplit_.reset(); | ||
| } | ||
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| void EqualityDeleteFileReader::readSingleColumnDeleteValues( | ||
| SubfieldFilters& subfieldFilters) { | ||
| std::unique_ptr<Filter> filter = std::make_unique<AlwaysTrue>(); | ||
| while (deleteRowReader_->next(kMaxBatchRows, deleteValuesOutput_)) { | ||
| if (deleteValuesOutput_->size() == 0) { | ||
| continue; | ||
| } | ||
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| deleteValuesOutput_->loadedVector(); | ||
| auto vector = | ||
| std::dynamic_pointer_cast<RowVector>(deleteValuesOutput_)->childAt(0); | ||
| auto name = rowType_->nameOf(0); | ||
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| auto typeKind = vector->type()->kind(); | ||
| VELOX_CHECK( | ||
| typeKind != TypeKind::DOUBLE && typeKind != TypeKind::REAL, | ||
| "Iceberg does not allow DOUBLE or REAL columns as the equality delete columns: {} : {}", | ||
| name, | ||
| typeKind); | ||
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| auto notExistsFilter = | ||
| createNotExistsFilter(vector, 0, deleteValuesOutput_->size(), typeKind); | ||
| filter = filter->mergeWith(notExistsFilter.get()); | ||
| } | ||
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| if (filter->kind() != FilterKind::kAlwaysTrue) { | ||
| if (subfieldFilters.find(common::Subfield(rowType_->nameOf(0))) != | ||
| subfieldFilters.end()) { | ||
| subfieldFilters[common::Subfield(rowType_->nameOf(0))] = | ||
| subfieldFilters[common::Subfield(rowType_->nameOf(0))]->mergeWith( | ||
| filter.get()); | ||
| } else { | ||
| subfieldFilters[common::Subfield(rowType_->nameOf(0))] = | ||
| std::move(filter); | ||
| } | ||
| } | ||
| } | ||
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| void EqualityDeleteFileReader::readMultipleColumnDeleteValues( | ||
| std::vector<core::TypedExprPtr>& expressionInputs) { | ||
| auto numDeleteFields = rowType_->size(); | ||
| VELOX_CHECK_GT( | ||
| numDeleteFields, | ||
| 0, | ||
| "Iceberg equality delete file should have at least one field."); | ||
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| // TODO: logical expression simplifications | ||
| while (deleteRowReader_->next(kMaxBatchRows, deleteValuesOutput_)) { | ||
| if (deleteValuesOutput_->size() == 0) { | ||
| continue; | ||
| } | ||
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| deleteValuesOutput_->loadedVector(); | ||
| auto rowVector = std::dynamic_pointer_cast<RowVector>(deleteValuesOutput_); | ||
| auto numDeletedValues = rowVector->childAt(0)->size(); | ||
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| for (int i = 0; i < numDeletedValues; i++) { | ||
| std::vector<core::TypedExprPtr> disconjunctInputs; | ||
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| for (int j = 0; j < numDeleteFields; j++) { | ||
| auto type = rowType_->childAt(j); | ||
| auto name = rowType_->nameOf(j); | ||
| auto value = BaseVector::wrapInConstant(1, i, rowVector->childAt(j)); | ||
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| std::vector<core::TypedExprPtr> isNotEqualInputs; | ||
| isNotEqualInputs.push_back( | ||
| std::make_shared<FieldAccessTypedExpr>(type, name)); | ||
| isNotEqualInputs.push_back(std::make_shared<ConstantTypedExpr>(value)); | ||
| auto isNotEqualExpr = | ||
| std::make_shared<CallTypedExpr>(BOOLEAN(), isNotEqualInputs, "neq"); | ||
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| disconjunctInputs.push_back(isNotEqualExpr); | ||
| } | ||
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| auto disconjunctNotEqualExpr = | ||
| std::make_shared<CallTypedExpr>(BOOLEAN(), disconjunctInputs, "or"); | ||
| expressionInputs.push_back(disconjunctNotEqualExpr); | ||
| } | ||
| } | ||
| } | ||
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| } // namespace facebook::velox::connector::hive::iceberg | ||
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