Backport #71526 to 24.8: Fix counting column size in wide part for Dynamic and JSON types

src/Storages/MergeTree/IMergeTreeDataPart.cpp

@@ -2242,18 +2242,18 @@ void IMergeTreeDataPart::checkConsistencyWithProjections(bool require_part_metad
         proj_part->checkConsistency(require_part_metadata);
 }
 
-void IMergeTreeDataPart::calculateColumnsAndSecondaryIndicesSizesOnDisk()
+void IMergeTreeDataPart::calculateColumnsAndSecondaryIndicesSizesOnDisk(std::optional<Block> columns_sample)
 {
-    calculateColumnsSizesOnDisk();
+    calculateColumnsSizesOnDisk(columns_sample);
     calculateSecondaryIndicesSizesOnDisk();
 }
 
-void IMergeTreeDataPart::calculateColumnsSizesOnDisk()
+void IMergeTreeDataPart::calculateColumnsSizesOnDisk(std::optional<Block> columns_sample)
 {
     if (getColumns().empty() || checksums.empty())
         throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot calculate columns sizes when columns or checksums are not initialized");
 
-    calculateEachColumnSizes(columns_sizes, total_columns_size);
+    calculateEachColumnSizes(columns_sizes, total_columns_size, columns_sample);
 }
 
 void IMergeTreeDataPart::calculateSecondaryIndicesSizesOnDisk()
@@ -2500,22 +2500,24 @@ ColumnPtr IMergeTreeDataPart::getColumnSample(const NameAndTypePair & column) co
 
     StorageMetadataPtr metadata_ptr = storage.getInMemoryMetadataPtr();
     StorageSnapshotPtr storage_snapshot_ptr = std::make_shared<StorageSnapshot>(storage, metadata_ptr);
+    MergeTreeReaderSettings settings;
+    settings.can_read_part_without_marks = true;
 
     MergeTreeReaderPtr reader = getReader(
         cols,
         storage_snapshot_ptr,
-        MarkRanges{MarkRange(0, 1)},
+        MarkRanges{MarkRange(0, total_mark)},
         /*virtual_fields=*/ {},
         /*uncompressed_cache=*/{},
         storage.getContext()->getMarkCache().get(),
         std::make_shared<AlterConversions>(),
-        MergeTreeReaderSettings{},
+        settings,
         ValueSizeMap{},
         ReadBufferFromFileBase::ProfileCallback{});
 
     Columns result;
     result.resize(1);
-    reader->readRows(0, 1, false, 0, result);
+    reader->readRows(0, total_mark, false, 0, result);
     return result[0];
 }
 

src/Storages/MergeTree/IMergeTreeDataPart.h

@@ -423,7 +423,7 @@ public:
     bool shallParticipateInMerges(const StoragePolicyPtr & storage_policy) const;
 
     /// Calculate column and secondary indices sizes on disk.
-    void calculateColumnsAndSecondaryIndicesSizesOnDisk();
+    void calculateColumnsAndSecondaryIndicesSizesOnDisk(std::optional<Block> columns_sample = std::nullopt);
 
     std::optional<String> getRelativePathForPrefix(const String & prefix, bool detached = false, bool broken = false) const;
 
@@ -628,7 +628,7 @@ protected:
 
     /// Fill each_columns_size and total_size with sizes from columns files on
     /// disk using columns and checksums.
-    virtual void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const = 0;
+    virtual void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size, std::optional<Block> columns_sample) const = 0;
 
     std::optional<String> getRelativePathForDetachedPart(const String & prefix, bool broken) const;
 
@@ -710,7 +710,7 @@ private:
 
     void loadPartitionAndMinMaxIndex();
 
-    void calculateColumnsSizesOnDisk();
+    void calculateColumnsSizesOnDisk(std::optional<Block> columns_sample = std::nullopt);
 
     void calculateSecondaryIndicesSizesOnDisk();
 

src/Storages/MergeTree/IMergeTreeDataPartWriter.h

@@ -47,6 +47,8 @@ public:
     Columns releaseIndexColumns();
     const MergeTreeIndexGranularity & getIndexGranularity() const { return index_granularity; }
 
+    virtual Block getColumnsSample() const = 0;
+
 protected:
     SerializationPtr getSerialization(const String & column_name) const;
 

src/Storages/MergeTree/MergeTreeDataPartCompact.cpp

@@ -81,7 +81,7 @@ MergeTreeDataPartWriterPtr createMergeTreeDataPartCompactWriter(
 }
 
 
-void MergeTreeDataPartCompact::calculateEachColumnSizes(ColumnSizeByName & /*each_columns_size*/, ColumnSize & total_size) const
+void MergeTreeDataPartCompact::calculateEachColumnSizes(ColumnSizeByName & /*each_columns_size*/, ColumnSize & total_size, std::optional<Block> /*columns_sample*/) const
 {
     auto bin_checksum = checksums.files.find(DATA_FILE_NAME_WITH_EXTENSION);
     if (bin_checksum != checksums.files.end())

src/Storages/MergeTree/MergeTreeDataPartCompact.h

@@ -65,8 +65,8 @@ private:
      /// Loads marks index granularity into memory
      void loadIndexGranularity() override;
 
-     /// Compact parts doesn't support per column size, only total size
+     /// Compact parts don't support per column size, only total size
-     void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
+     void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size, std::optional<Block> columns_sample) const override;
 };
 
 }

src/Storages/MergeTree/MergeTreeDataPartWide.cpp

@@ -82,7 +82,7 @@ MergeTreeDataPartWriterPtr createMergeTreeDataPartWideWriter(
 /// Takes into account the fact that several columns can e.g. share their .size substreams.
 /// When calculating totals these should be counted only once.
 ColumnSize MergeTreeDataPartWide::getColumnSizeImpl(
-    const NameAndTypePair & column, std::unordered_set<String> * processed_substreams) const
+    const NameAndTypePair & column, std::unordered_set<String> * processed_substreams, std::optional<Block> columns_sample) const
 {
     ColumnSize size;
     if (checksums.empty())
@@ -108,7 +108,7 @@ ColumnSize MergeTreeDataPartWide::getColumnSizeImpl(
         auto mrk_checksum = checksums.files.find(*stream_name + getMarksFileExtension());
         if (mrk_checksum != checksums.files.end())
             size.marks += mrk_checksum->second.file_size;
-    });
+    }, column.type, columns_sample && columns_sample->has(column.name) ? columns_sample->getByName(column.name).column : getColumnSample(column));
 
     return size;
 }
@@ -328,12 +328,12 @@ std::optional<String> MergeTreeDataPartWide::getFileNameForColumn(const NameAndT
     return filename;
 }
 
-void MergeTreeDataPartWide::calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const
+void MergeTreeDataPartWide::calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size, std::optional<Block> columns_sample) const
 {
     std::unordered_set<String> processed_substreams;
     for (const auto & column : columns)
     {
-        ColumnSize size = getColumnSizeImpl(column, &processed_substreams);
+        ColumnSize size = getColumnSizeImpl(column, &processed_substreams, columns_sample);
         each_columns_size[column.name] = size;
         total_size.add(size);
 

src/Storages/MergeTree/MergeTreeDataPartWide.h

@@ -60,9 +60,9 @@ private:
     /// Loads marks index granularity into memory
     void loadIndexGranularity() override;
 
-    ColumnSize getColumnSizeImpl(const NameAndTypePair & column, std::unordered_set<String> * processed_substreams) const;
+    ColumnSize getColumnSizeImpl(const NameAndTypePair & column, std::unordered_set<String> * processed_substreams, std::optional<Block> columns_sample) const;
 
-    void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
+    void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size, std::optional<Block> columns_sample) const override;
 
 };
 

src/Storages/MergeTree/MergeTreeDataPartWriterOnDisk.h

@@ -122,6 +122,8 @@ public:
         written_offset_columns = written_offset_columns_;
     }
 
+    Block getColumnsSample() const override { return block_sample; }
+
 protected:
      /// Count index_granularity for block and store in `index_granularity`
     size_t computeIndexGranularity(const Block & block) const;

src/Storages/MergeTree/MergeTreeReaderWide.cpp

@@ -172,7 +172,7 @@ size_t MergeTreeReaderWide::readRows(
                 throw;
             }
 
-            if (column->empty())
+            if (column->empty() && max_rows_to_read > 0)
                 res_columns[pos] = nullptr;
         }
 

src/Storages/MergeTree/MergedBlockOutputStream.cpp

@@ -205,7 +205,7 @@ MergedBlockOutputStream::Finalizer MergedBlockOutputStream::finalizePartAsync(
     new_part->setBytesOnDisk(checksums.getTotalSizeOnDisk());
     new_part->setBytesUncompressedOnDisk(checksums.getTotalSizeUncompressedOnDisk());
     new_part->index_granularity = writer->getIndexGranularity();
-    new_part->calculateColumnsAndSecondaryIndicesSizesOnDisk();
+    new_part->calculateColumnsAndSecondaryIndicesSizesOnDisk(writer->getColumnsSample());
 
     /// In mutation, existing_rows_count is already calculated in PartMergerWriter
     /// In merge situation, lightweight deleted rows was physically deleted, existing_rows_count equals rows_count

tests/queries/0_stateless/03262_column_sizes_with_dynamic_structure.reference

@@ -0,0 +1 @@
+test	10.00 million	352.87 MiB	39.43 MiB	39.45 MiB

tests/queries/0_stateless/03262_column_sizes_with_dynamic_structure.sql

@@ -0,0 +1,23 @@
+-- Tags: no-random-settings
+
+set allow_experimental_dynamic_type = 1;
+set allow_experimental_json_type = 1;
+
+
+drop table if exists test;
+create table test (d Dynamic, json JSON) engine=MergeTree order by tuple() settings min_rows_for_wide_part=0, min_bytes_for_wide_part=1;
+insert into test select number, '{"a" : 42, "b" : "Hello, World"}' from numbers(10000000);
+
+SELECT
+    `table`,
+    formatReadableQuantity(sum(rows)) AS rows,
+    formatReadableSize(sum(data_uncompressed_bytes)) AS data_size_uncompressed,
+    formatReadableSize(sum(data_compressed_bytes)) AS data_size_compressed,
+    formatReadableSize(sum(bytes_on_disk)) AS total_size_on_disk
+FROM system.parts
+WHERE active AND (database = currentDatabase()) AND (`table` = 'test')
+GROUP BY `table`
+ORDER BY `table` ASC;
+
+drop table test;
+