GH-40592: [C++][Parquet] Implement SizeStatistics

cpp/src/arrow/util/hashing.h

@@ -843,6 +843,14 @@ class BinaryMemoTable : public MemoTable {
     }
   }
 
+  // Visit the stored value at a specific index in insertion order.
+  // The visitor function should have the signature `void(std::string_view)`
+  // or `void(const std::string_view&)`.
+  template <typename VisitFunc>
+  void VisitValue(int32_t idx, VisitFunc&& visit) const {
+    visit(binary_builder_.GetView(idx));
+  }
+
  protected:
   struct Payload {
     int32_t memo_index;

cpp/src/parquet/CMakeLists.txt

@@ -181,6 +181,7 @@ set(PARQUET_SRCS
     printer.cc
     properties.cc
     schema.cc
+    size_statistics.cc
     statistics.cc
     stream_reader.cc
     stream_writer.cc
@@ -373,6 +374,7 @@ add_parquet_test(internals-test
                  metadata_test.cc
                  page_index_test.cc
                  public_api_test.cc
+                 size_statistics_test.cc
                  types_test.cc)
 
 set_source_files_properties(public_api_test.cc PROPERTIES SKIP_PRECOMPILE_HEADERS ON

cpp/src/parquet/column_page.h

@@ -26,6 +26,7 @@
 #include <optional>
 #include <string>
 
+#include "parquet/size_statistics.h"
 #include "parquet/statistics.h"
 #include "parquet/types.h"
 
@@ -69,27 +70,30 @@ class DataPage : public Page {
   /// Currently it is only present from data pages created by ColumnWriter in order
   /// to collect page index.
   std::optional<int64_t> first_row_index() const { return first_row_index_; }
+  const SizeStatistics& size_statistics() const { return size_statistics_; }
 
   virtual ~DataPage() = default;
 
  protected:
   DataPage(PageType::type type, const std::shared_ptr<Buffer>& buffer, int32_t num_values,
            Encoding::type encoding, int64_t uncompressed_size,
-           EncodedStatistics statistics = EncodedStatistics(),
-           std::optional<int64_t> first_row_index = std::nullopt)
+           EncodedStatistics statistics, std::optional<int64_t> first_row_index,
+           SizeStatistics size_statistics)
       : Page(buffer, type),
         num_values_(num_values),
         encoding_(encoding),
         uncompressed_size_(uncompressed_size),
         statistics_(std::move(statistics)),
-        first_row_index_(std::move(first_row_index)) {}
+        first_row_index_(std::move(first_row_index)),
+        size_statistics_(std::move(size_statistics)) {}
 
   int32_t num_values_;
   Encoding::type encoding_;
   int64_t uncompressed_size_;
   EncodedStatistics statistics_;
   /// Row ordinal within the row group to the first row in the data page.
   std::optional<int64_t> first_row_index_;
+  SizeStatistics size_statistics_;
 };
 
 class DataPageV1 : public DataPage {
@@ -98,9 +102,11 @@ class DataPageV1 : public DataPage {
              Encoding::type encoding, Encoding::type definition_level_encoding,
              Encoding::type repetition_level_encoding, int64_t uncompressed_size,
              EncodedStatistics statistics = EncodedStatistics(),
-             std::optional<int64_t> first_row_index = std::nullopt)
+             std::optional<int64_t> first_row_index = std::nullopt,
+             SizeStatistics size_statistics = SizeStatistics())
       : DataPage(PageType::DATA_PAGE, buffer, num_values, encoding, uncompressed_size,
-                 std::move(statistics), std::move(first_row_index)),
+                 std::move(statistics), std::move(first_row_index),
+                 std::move(size_statistics)),
         definition_level_encoding_(definition_level_encoding),
         repetition_level_encoding_(repetition_level_encoding) {}
 
@@ -120,9 +126,11 @@ class DataPageV2 : public DataPage {
              int32_t definition_levels_byte_length, int32_t repetition_levels_byte_length,
              int64_t uncompressed_size, bool is_compressed = false,
              EncodedStatistics statistics = EncodedStatistics(),
-             std::optional<int64_t> first_row_index = std::nullopt)
+             std::optional<int64_t> first_row_index = std::nullopt,
+             SizeStatistics size_statistics = SizeStatistics())
       : DataPage(PageType::DATA_PAGE_V2, buffer, num_values, encoding, uncompressed_size,
-                 std::move(statistics), std::move(first_row_index)),
+                 std::move(statistics), std::move(first_row_index),
+                 std::move(size_statistics)),
         num_nulls_(num_nulls),
         num_rows_(num_rows),
         definition_levels_byte_length_(definition_levels_byte_length),

cpp/src/parquet/column_writer.cc

@@ -55,6 +55,7 @@
 #include "parquet/platform.h"
 #include "parquet/properties.h"
 #include "parquet/schema.h"
+#include "parquet/size_statistics.h"
 #include "parquet/statistics.h"
 #include "parquet/thrift_internal.h"
 #include "parquet/types.h"
@@ -437,7 +438,7 @@ class SerializedPageWriter : public PageWriter {
 
     /// Collect page index
     if (column_index_builder_ != nullptr) {
-      column_index_builder_->AddPage(page.statistics());
+      column_index_builder_->AddPage(page.statistics(), page.size_statistics());
     }
     if (offset_index_builder_ != nullptr) {
       const int64_t compressed_size = output_data_len + header_size;
@@ -451,8 +452,9 @@ class SerializedPageWriter : public PageWriter {
       /// start_pos is a relative offset in the buffered mode. It should be
       /// adjusted via OffsetIndexBuilder::Finish() after BufferedPageWriter
       /// has flushed all data pages.
-      offset_index_builder_->AddPage(start_pos, static_cast<int32_t>(compressed_size),
-                                     *page.first_row_index());
+      offset_index_builder_->AddPage(
+          start_pos, static_cast<int32_t>(compressed_size), *page.first_row_index(),
+          page.size_statistics().unencoded_byte_array_data_bytes);
     }
 
     total_uncompressed_size_ += uncompressed_size + header_size;
@@ -774,11 +776,17 @@ class ColumnWriterImpl {
   // Serializes Dictionary Page if enabled
   virtual void WriteDictionaryPage() = 0;
 
+  // A convenience struct to combine the encoded statistics and size statistics
+  struct StatisticsPair {
+    EncodedStatistics encoded_stats;
+    SizeStatistics size_stats;
+  };
+
   // Plain-encoded statistics of the current page
-  virtual EncodedStatistics GetPageStatistics() = 0;
+  virtual StatisticsPair GetPageStatistics() = 0;
 
   // Plain-encoded statistics of the whole chunk
-  virtual EncodedStatistics GetChunkStatistics() = 0;
+  virtual StatisticsPair GetChunkStatistics() = 0;
 
   // Merges page statistics into chunk statistics, then resets the values
   virtual void ResetPageStatistics() = 0;
@@ -981,8 +989,7 @@ void ColumnWriterImpl::BuildDataPageV1(int64_t definition_levels_rle_size,
   PARQUET_THROW_NOT_OK(uncompressed_data_->Resize(uncompressed_size, false));
   ConcatenateBuffers(definition_levels_rle_size, repetition_levels_rle_size, values,
                      uncompressed_data_->mutable_data());
-
-  EncodedStatistics page_stats = GetPageStatistics();
+  auto [page_stats, page_size_stats] = GetPageStatistics();
   page_stats.ApplyStatSizeLimits(properties_->max_statistics_size(descr_->path()));
   page_stats.set_is_signed(SortOrder::SIGNED == descr_->sort_order());
   ResetPageStatistics();
@@ -1006,13 +1013,15 @@ void ColumnWriterImpl::BuildDataPageV1(int64_t definition_levels_rle_size,
         compressed_data->CopySlice(0, compressed_data->size(), allocator_));
     std::unique_ptr<DataPage> page_ptr = std::make_unique<DataPageV1>(
         compressed_data_copy, num_values, encoding_, Encoding::RLE, Encoding::RLE,
-        uncompressed_size, std::move(page_stats), first_row_index);
+        uncompressed_size, std::move(page_stats), first_row_index,
+        std::move(page_size_stats));
     total_compressed_bytes_ += page_ptr->size() + sizeof(format::PageHeader);
 
     data_pages_.push_back(std::move(page_ptr));
   } else {  // Eagerly write pages
     DataPageV1 page(compressed_data, num_values, encoding_, Encoding::RLE, Encoding::RLE,
-                    uncompressed_size, std::move(page_stats), first_row_index);
+                    uncompressed_size, std::move(page_stats), first_row_index,
+                    std::move(page_size_stats));
     WriteDataPage(page);
   }
 }
@@ -1039,7 +1048,7 @@ void ColumnWriterImpl::BuildDataPageV2(int64_t definition_levels_rle_size,
   ConcatenateBuffers(definition_levels_rle_size, repetition_levels_rle_size,
                      compressed_values, combined->mutable_data());
 
-  EncodedStatistics page_stats = GetPageStatistics();
+  auto [page_stats, page_size_stats] = GetPageStatistics();
   page_stats.ApplyStatSizeLimits(properties_->max_statistics_size(descr_->path()));
   page_stats.set_is_signed(SortOrder::SIGNED == descr_->sort_order());
   ResetPageStatistics();
@@ -1062,14 +1071,15 @@ void ColumnWriterImpl::BuildDataPageV2(int64_t definition_levels_rle_size,
                             combined->CopySlice(0, combined->size(), allocator_));
     std::unique_ptr<DataPage> page_ptr = std::make_unique<DataPageV2>(
         combined, num_values, null_count, num_rows, encoding_, def_levels_byte_length,
-        rep_levels_byte_length, uncompressed_size, pager_->has_compressor(), page_stats,
-        first_row_index);
+        rep_levels_byte_length, uncompressed_size, pager_->has_compressor(),
+        std::move(page_stats), first_row_index, std::move(page_size_stats));
     total_compressed_bytes_ += page_ptr->size() + sizeof(format::PageHeader);
     data_pages_.push_back(std::move(page_ptr));
   } else {
     DataPageV2 page(combined, num_values, null_count, num_rows, encoding_,
                     def_levels_byte_length, rep_levels_byte_length, uncompressed_size,
-                    pager_->has_compressor(), page_stats, first_row_index);
+                    pager_->has_compressor(), std::move(page_stats), first_row_index,
+                    std::move(page_size_stats));
     WriteDataPage(page);
   }
 }
@@ -1083,7 +1093,7 @@ int64_t ColumnWriterImpl::Close() {
 
     FlushBufferedDataPages();
 
-    EncodedStatistics chunk_statistics = GetChunkStatistics();
+    auto [chunk_statistics, chunk_size_statistics] = GetChunkStatistics();
     chunk_statistics.ApplyStatSizeLimits(
         properties_->max_statistics_size(descr_->path()));
     chunk_statistics.set_is_signed(SortOrder::SIGNED == descr_->sort_order());
@@ -1092,6 +1102,9 @@ int64_t ColumnWriterImpl::Close() {
     if (rows_written_ > 0 && chunk_statistics.is_set()) {
       metadata_->SetStatistics(chunk_statistics);
     }
+    if (rows_written_ > 0 && chunk_size_statistics.is_set()) {
+      metadata_->SetSizeStatistics(chunk_size_statistics);
+    }
     metadata_->SetKeyValueMetadata(key_value_metadata_);
     pager_->Close(has_dictionary_, fallback_);
   }
@@ -1217,6 +1230,11 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
       page_statistics_ = MakeStatistics<DType>(descr_, allocator_);
       chunk_statistics_ = MakeStatistics<DType>(descr_, allocator_);
     }
+    if (properties->size_statistics_level() == SizeStatisticsLevel::ColumnChunk ||
+        properties->size_statistics_level() == SizeStatisticsLevel::PageAndColumnChunk) {
+      page_size_statistics_ = SizeStatistics::Make(descr_);
+      chunk_size_statistics_ = SizeStatistics::Make(descr_);
+    }
     pages_change_on_record_boundaries_ =
         properties->data_page_version() == ParquetDataPageVersion::V2 ||
         properties->page_index_enabled(descr_->path());
@@ -1355,15 +1373,26 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
     total_bytes_written_ += pager_->WriteDictionaryPage(page);
   }
 
-  EncodedStatistics GetPageStatistics() override {
-    EncodedStatistics result;
-    if (page_statistics_) result = page_statistics_->Encode();
+  StatisticsPair GetPageStatistics() override {
+    StatisticsPair result;
+    if (page_statistics_) {
+      result.encoded_stats = page_statistics_->Encode();
+    }
+    if (properties_->size_statistics_level() == SizeStatisticsLevel::PageAndColumnChunk) {
+      ARROW_DCHECK(page_size_statistics_ != nullptr);
+      result.size_stats = *page_size_statistics_;
+    }
     return result;
   }
 
-  EncodedStatistics GetChunkStatistics() override {
-    EncodedStatistics result;
-    if (chunk_statistics_) result = chunk_statistics_->Encode();
+  StatisticsPair GetChunkStatistics() override {
+    StatisticsPair result;
+    if (chunk_statistics_) {
+      result.encoded_stats = chunk_statistics_->Encode();
+    }
+    if (chunk_size_statistics_) {
+      result.size_stats = *chunk_size_statistics_;
+    }
     return result;
   }
 
@@ -1372,6 +1401,10 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
       chunk_statistics_->Merge(*page_statistics_);
       page_statistics_->Reset();
     }
+    if (page_size_statistics_ != nullptr) {
+      chunk_size_statistics_->Merge(*page_size_statistics_);
+      page_size_statistics_->Reset();
+    }
   }
 
   Type::type type() const override { return descr_->physical_type(); }
@@ -1425,6 +1458,8 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
   DictEncoder<DType>* current_dict_encoder_;
   std::shared_ptr<TypedStats> page_statistics_;
   std::shared_ptr<TypedStats> chunk_statistics_;
+  std::unique_ptr<SizeStatistics> page_size_statistics_;
+  std::shared_ptr<SizeStatistics> chunk_size_statistics_;
   bool pages_change_on_record_boundaries_;
 
   // If writing a sequence of ::arrow::DictionaryArray to the writer, we keep the
@@ -1467,6 +1502,8 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
       rows_written_ += num_values;
       num_buffered_rows_ += num_values;
     }
+
+    UpdateLevelHistogram(num_values, def_levels, rep_levels);
     return values_to_write;
   }
 
@@ -1558,6 +1595,47 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
       rows_written_ += num_levels;
       num_buffered_rows_ += num_levels;
     }
+
+    UpdateLevelHistogram(num_levels, def_levels, rep_levels);
+  }
+
+  void UpdateLevelHistogram(int64_t num_levels, const int16_t* def_levels,
+                            const int16_t* rep_levels) const {
+    if (page_size_statistics_ == nullptr) {
+      return;
+    }
+
+    auto add_levels = [](std::vector<int64_t>& level_histogram,
+                         ::arrow::util::span<const int16_t> levels) {
+      for (int16_t level : levels) {
+        ARROW_DCHECK_LT(level, static_cast<int16_t>(level_histogram.size()));
+        ++level_histogram[level];
+      }
+    };
+
+    if (descr_->max_definition_level() > 0) {
+      add_levels(page_size_statistics_->definition_level_histogram,
+                 {def_levels, static_cast<size_t>(num_levels)});
+    } else {
+      page_size_statistics_->definition_level_histogram[0] += num_levels;
+    }
+
+    if (descr_->max_repetition_level() > 0) {
+      add_levels(page_size_statistics_->repetition_level_histogram,
+                 {rep_levels, static_cast<size_t>(num_levels)});
+    } else {
+      page_size_statistics_->repetition_level_histogram[0] += num_levels;
+    }
+  }
+
+  // Update the unencoded data bytes for ByteArray only per the specification.
+  void UpdateUnencodedDataBytes() const {
+    if constexpr (std::is_same_v<T, ByteArray>) {
+      if (page_size_statistics_ != nullptr) {
+        page_size_statistics_->IncrementUnencodedByteArrayDataBytes(
+            current_encoder_->ReportUnencodedDataBytes());
+      }
+    }
   }
 
   void CommitWriteAndCheckPageLimit(int64_t num_levels, int64_t num_values,
@@ -1611,6 +1689,7 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
     if (page_statistics_ != nullptr) {
       page_statistics_->Update(values, num_values, num_nulls);
     }
+    UpdateUnencodedDataBytes();
   }
 
   /// \brief Write values with spaces and update page statistics accordingly.
@@ -1639,6 +1718,7 @@ class TypedColumnWriterImpl : public ColumnWriterImpl, public TypedColumnWriter<
       page_statistics_->UpdateSpaced(values, valid_bits, valid_bits_offset,
                                      num_spaced_values, num_values, num_nulls);
     }
+    UpdateUnencodedDataBytes();
   }
 };
 
@@ -1739,6 +1819,8 @@ Status TypedColumnWriterImpl<DType>::WriteArrowDictionary(
         writeable_indices,
         MaybeReplaceValidity(writeable_indices, null_count, ctx->memory_pool));
     dict_encoder->PutIndices(*writeable_indices);
+    // Update unencoded byte array data size to size statistics
+    UpdateUnencodedDataBytes();
     CommitWriteAndCheckPageLimit(batch_size, batch_num_values, null_count, check_page);
     value_offset += batch_num_spaced_values;
   };
@@ -2219,6 +2301,7 @@ Status TypedColumnWriterImpl<ByteArrayType>::WriteArrowDense(
       page_statistics_->IncrementNullCount(batch_size - non_null);
       page_statistics_->IncrementNumValues(non_null);
     }
+    UpdateUnencodedDataBytes();
     CommitWriteAndCheckPageLimit(batch_size, batch_num_values, batch_size - non_null,
                                  check_page);
     CheckDictionarySizeLimit();