fix: Allow association with a delta file with no corresponding row in…

… case of empty base file (facebookincubator#11746) Summary: Pull Request resolved: facebookincubator#11746 Reviewed By: darrenfu Differential Revision: D66773290
Yuhta · Dec 5, 2024 · 410e09f · 410e09f
1 parent 627adac
commit 410e09f
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Showing 3 changed files with 50 additions and 38 deletions.
diff --git a/velox/connectors/hive/SplitReader.cpp b/velox/connectors/hive/SplitReader.cpp
@@ -146,14 +146,14 @@ void SplitReader::configureReaderOptions(
 void SplitReader::prepareSplit(
     std::shared_ptr<common::MetadataFilter> metadataFilter,
     dwio::common::RuntimeStatistics& runtimeStats) {
-  createReader(std::move(metadataFilter));
+  auto rowType = createReader();
 
   if (checkIfSplitIsEmpty(runtimeStats)) {
     VELOX_CHECK(emptySplit_);
     return;
   }
 
-  createRowReader();
+  createRowReader(std::move(metadataFilter), std::move(rowType));
 }
 
 uint64_t SplitReader::next(uint64_t size, VectorPtr& output) {
@@ -220,8 +220,7 @@ std::string SplitReader::toString() const {
       static_cast<const void*>(baseRowReader_.get()));
 }
 
-void SplitReader::createReader(
-    std::shared_ptr<common::MetadataFilter> metadataFilter) {
+RowTypePtr SplitReader::createReader() {
   VELOX_CHECK_NE(
       baseReaderOpts_.fileFormat(), dwio::common::FileFormat::UNKNOWN);
 
@@ -237,7 +236,7 @@ void SplitReader::createReader(
         hiveConfig_->ignoreMissingFiles(
             connectorQueryCtx_->sessionProperties())) {
       emptySplit_ = true;
-      return;
+      return nullptr;
     }
     throw;
   }
@@ -262,15 +261,22 @@ void SplitReader::createReader(
   auto& fileType = baseReader_->rowType();
   auto columnTypes = adaptColumns(fileType, baseReaderOpts_.fileSchema());
   auto columnNames = fileType->names();
-  configureRowReaderOptions(
-      hiveTableHandle_->tableParameters(),
-      scanSpec_,
-      std::move(metadataFilter),
-      ROW(std::move(columnNames), std::move(columnTypes)),
-      hiveSplit_,
-      hiveConfig_,
-      connectorQueryCtx_->sessionProperties(),
-      baseRowReaderOpts_);
+  return ROW(std::move(columnNames), std::move(columnTypes));
+}
+
+bool SplitReader::filterOnStats(
+    dwio::common::RuntimeStatistics& runtimeStats) const {
+  if (testFilters(
+          scanSpec_.get(),
+          baseReader_.get(),
+          hiveSplit_->filePath,
+          hiveSplit_->partitionKeys,
+          *partitionKeys_)) {
+    return true;
+  }
+  ++runtimeStats.skippedSplits;
+  runtimeStats.skippedSplitBytes += hiveSplit_->length;
+  return false;
 }
 
 bool SplitReader::checkIfSplitIsEmpty(
@@ -280,35 +286,32 @@ bool SplitReader::checkIfSplitIsEmpty(
   if (emptySplit_) {
     return true;
   }
-
-  if (!baseReader_ || baseReader_->numberOfRows() == 0) {
+  if (!baseReader_ || baseReader_->numberOfRows() == 0 ||
+      !filterOnStats(runtimeStats)) {
     emptySplit_ = true;
-  } else {
-    // Check filters and see if the whole split can be skipped. Note that this
-    // doesn't apply to Hudi tables.
-    if (!testFilters(
-            scanSpec_.get(),
-            baseReader_.get(),
-            hiveSplit_->filePath,
-            hiveSplit_->partitionKeys,
-            *partitionKeys_)) {
-      ++runtimeStats.skippedSplits;
-      runtimeStats.skippedSplitBytes += hiveSplit_->length;
-      emptySplit_ = true;
-    }
   }
-
   return emptySplit_;
 }
 
-void SplitReader::createRowReader() {
+void SplitReader::createRowReader(
+    std::shared_ptr<common::MetadataFilter> metadataFilter,
+    RowTypePtr rowType) {
   VELOX_CHECK_NULL(baseRowReader_);
+  configureRowReaderOptions(
+      hiveTableHandle_->tableParameters(),
+      scanSpec_,
+      std::move(metadataFilter),
+      std::move(rowType),
+      hiveSplit_,
+      hiveConfig_,
+      connectorQueryCtx_->sessionProperties(),
+      baseRowReaderOpts_);
   baseRowReader_ = baseReader_->createRowReader(baseRowReaderOpts_);
 }
 
 std::vector<TypePtr> SplitReader::adaptColumns(
     const RowTypePtr& fileType,
-    const std::shared_ptr<const velox::RowType>& tableSchema) {
+    const std::shared_ptr<const velox::RowType>& tableSchema) const {
   // Keep track of schema types for columns in file, used by ColumnSelector.
   std::vector<TypePtr> columnTypes = fileType->children();
 

diff --git a/velox/connectors/hive/SplitReader.h b/velox/connectors/hive/SplitReader.h
@@ -113,7 +113,12 @@ class SplitReader {
 
   /// Create the dwio::common::Reader object baseReader_, which will be used to
   /// read the data file's metadata and schema
-  void createReader(std::shared_ptr<common::MetadataFilter> metadataFilter);
+  RowTypePtr createReader();
+
+  // Check if the filters pass on the column statistics.  When delta update is
+  // present, the corresonding filter should be disabled before calling this
+  // function.
+  bool filterOnStats(dwio::common::RuntimeStatistics& runtimeStats) const;
 
   /// Check if the hiveSplit_ is empty. The split is considered empty when
   ///   1) The data file is missing but the user chooses to ignore it
@@ -125,19 +130,23 @@ class SplitReader {
 
   /// Create the dwio::common::RowReader object baseRowReader_, which owns the
   /// ColumnReaders that will be used to read the data
-  void createRowReader();
+  void createRowReader(
+      std::shared_ptr<common::MetadataFilter> metadataFilter,
+      RowTypePtr rowType);
 
+ private:
   /// Different table formats may have different meatadata columns.
   /// This function will be used to update the scanSpec for these columns.
-  virtual std::vector<TypePtr> adaptColumns(
+  std::vector<TypePtr> adaptColumns(
       const RowTypePtr& fileType,
-      const std::shared_ptr<const velox::RowType>& tableSchema);
+      const std::shared_ptr<const velox::RowType>& tableSchema) const;
 
   void setPartitionValue(
       common::ScanSpec* spec,
       const std::string& partitionKey,
       const std::optional<std::string>& value) const;
 
+ protected:
   std::shared_ptr<const HiveConnectorSplit> hiveSplit_;
   const std::shared_ptr<const HiveTableHandle> hiveTableHandle_;
   const std::unordered_map<

diff --git a/velox/connectors/hive/iceberg/IcebergSplitReader.cpp b/velox/connectors/hive/iceberg/IcebergSplitReader.cpp
@@ -55,14 +55,14 @@ IcebergSplitReader::IcebergSplitReader(
 void IcebergSplitReader::prepareSplit(
     std::shared_ptr<common::MetadataFilter> metadataFilter,
     dwio::common::RuntimeStatistics& runtimeStats) {
-  createReader(std::move(metadataFilter));
+  auto rowType = createReader();
 
   if (checkIfSplitIsEmpty(runtimeStats)) {
     VELOX_CHECK(emptySplit_);
     return;
   }
 
-  createRowReader();
+  createRowReader(std::move(metadataFilter), std::move(rowType));
 
   std::shared_ptr<const HiveIcebergSplit> icebergSplit =
       std::dynamic_pointer_cast<const HiveIcebergSplit>(hiveSplit_);