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#pragma once
#include <Storages/MergeTree/IMergeTreeDataPart.h>
namespace DB
{
class UncompressedCache;
class MergeTreeDataPartInMemory : public IMergeTreeDataPart
{
public:
MergeTreeDataPartInMemory(
const MergeTreeData & storage_,
const String & name_,
const MergeTreePartInfo & info_,
const MutableDataPartStoragePtr & data_part_storage_,
const IMergeTreeDataPart * parent_part_ = nullptr);
MergeTreeReaderPtr getReader(
const NamesAndTypesList & columns,
const StorageSnapshotPtr & storage_snapshot,
const MarkRanges & mark_ranges,
UncompressedCache * uncompressed_cache,
MarkCache * mark_cache,
const AlterConversionsPtr & alter_conversions,
const MergeTreeReaderSettings & reader_settings_,
const ValueSizeMap & avg_value_size_hints,
const ReadBufferFromFileBase::ProfileCallback & profile_callback) const override;
MergeTreeWriterPtr getWriter(
const NamesAndTypesList & columns_list,
const StorageMetadataPtr & metadata_snapshot,
const std::vector<MergeTreeIndexPtr> & indices_to_recalc,
const CompressionCodecPtr & default_codec_,
const MergeTreeWriterSettings & writer_settings,
const MergeTreeIndexGranularity & computed_index_granularity) override;
bool isStoredOnDisk() const override { return false; }
bool isStoredOnRemoteDisk() const override { return false; }
bool isStoredOnRemoteDiskWithZeroCopySupport() const override { return false; }
bool hasColumnFiles(const NameAndTypePair & column) const override { return !!getColumnPosition(column.getNameInStorage()); }
String getFileNameForColumn(const NameAndTypePair & /* column */) const override { return ""; }
void renameTo(const String & new_relative_path, bool remove_new_dir_if_exists) override;
DataPartStoragePtr makeCloneInDetached(const String & prefix, const StorageMetadataPtr & metadata_snapshot,
const DiskTransactionPtr & disk_transaction) const override;
std::optional<time_t> getColumnModificationTime(const String & /* column_name */) const override { return {}; }
MutableDataPartStoragePtr flushToDisk(const String & new_relative_path, const StorageMetadataPtr & metadata_snapshot) const;
/// Returns hash of parts's block
Checksum calculateBlockChecksum() const;
mutable Block block;
private:
mutable std::condition_variable is_merged;
/// Calculates uncompressed sizes in memory.
void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
};
using DataPartInMemoryPtr = std::shared_ptr<const MergeTreeDataPartInMemory>;
using MutableDataPartInMemoryPtr = std::shared_ptr<MergeTreeDataPartInMemory>;
DataPartInMemoryPtr asInMemoryPart(const MergeTreeDataPartPtr & part);
}
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