mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 05:32:52 +00:00
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
#pragma once
|
|
#include <DataStreams/IBlockInputStream.h>
|
|
#include <Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.h>
|
|
#include <Storages/MergeTree/MergeTreeData.h>
|
|
#include <Storages/MergeTree/MarkRange.h>
|
|
#include <Storages/MergeTree/MergeTreeBlockReadUtils.h>
|
|
#include <Storages/SelectQueryInfo.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
|
|
/// Used to read data from single part with select query
|
|
/// Cares about PREWHERE, virtual columns, indexes etc.
|
|
/// To read data from multiple parts, Storage (MergeTree) creates multiple such objects.
|
|
class MergeTreeReverseSelectProcessor : public MergeTreeBaseSelectProcessor
|
|
{
|
|
public:
|
|
MergeTreeReverseSelectProcessor(
|
|
const MergeTreeData & storage,
|
|
const MergeTreeData::DataPartPtr & owned_data_part,
|
|
UInt64 max_block_size_rows,
|
|
size_t preferred_block_size_bytes,
|
|
size_t preferred_max_column_in_block_size_bytes,
|
|
Names required_columns_,
|
|
MarkRanges mark_ranges,
|
|
bool use_uncompressed_cache,
|
|
const PrewhereInfoPtr & prewhere_info,
|
|
bool check_columns,
|
|
const MergeTreeReaderSettings & reader_settings,
|
|
const Names & virt_column_names = {},
|
|
size_t part_index_in_query = 0,
|
|
bool quiet = false);
|
|
|
|
~MergeTreeReverseSelectProcessor() override;
|
|
|
|
String getName() const override { return "MergeTreeReverse"; }
|
|
|
|
/// Closes readers and unlock part locks
|
|
void finish();
|
|
|
|
protected:
|
|
|
|
bool getNewTask() override;
|
|
Chunk readFromPart() override;
|
|
|
|
private:
|
|
Block header;
|
|
|
|
/// Used by Task
|
|
Names required_columns;
|
|
/// Names from header. Used in order to order columns in read blocks.
|
|
Names ordered_names;
|
|
NameSet column_name_set;
|
|
|
|
MergeTreeReadTaskColumns task_columns;
|
|
|
|
/// Data part will not be removed if the pointer owns it
|
|
MergeTreeData::DataPartPtr data_part;
|
|
|
|
/// Mark ranges we should read (in ascending order)
|
|
MarkRanges all_mark_ranges;
|
|
/// Total number of marks we should read
|
|
size_t total_marks_count = 0;
|
|
/// Value of _part_index virtual column (used only in SelectExecutor)
|
|
size_t part_index_in_query = 0;
|
|
|
|
String path;
|
|
|
|
Chunks chunks;
|
|
|
|
Logger * log = &Logger::get("MergeTreeReverseSelectProcessor");
|
|
};
|
|
|
|
}
|