mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
101 lines
3.8 KiB
C++
101 lines
3.8 KiB
C++
#pragma once
|
|
|
|
#include <common/shared_ptr_helper.h>
|
|
|
|
#include <Storages/StorageSet.h>
|
|
#include <Storages/JoinSettings.h>
|
|
#include <Parsers/ASTTablesInSelectQuery.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class TableJoin;
|
|
class HashJoin;
|
|
using HashJoinPtr = std::shared_ptr<HashJoin>;
|
|
|
|
/** Allows you save the state for later use on the right side of the JOIN.
|
|
* When inserted into a table, the data will be inserted into the state,
|
|
* and also written to the backup file, to restore after the restart.
|
|
* Reading from the table is not possible directly - only specifying on the right side of JOIN is possible.
|
|
*
|
|
* When using, JOIN must be of the appropriate type (ANY|ALL LEFT|INNER ...).
|
|
*/
|
|
class StorageJoin final : public shared_ptr_helper<StorageJoin>, public StorageSetOrJoinBase
|
|
{
|
|
friend struct shared_ptr_helper<StorageJoin>;
|
|
public:
|
|
String getName() const override { return "Join"; }
|
|
|
|
void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
|
|
|
|
/// Only delete is supported.
|
|
void checkMutationIsPossible(const MutationCommands & commands, const Settings & settings) const override;
|
|
void mutate(const MutationCommands & commands, ContextPtr context) override;
|
|
|
|
/// Return instance of HashJoin holding lock that protects from insertions to StorageJoin.
|
|
/// HashJoin relies on structure of hash table that's why we need to return it with locked mutex.
|
|
HashJoinPtr getJoinLocked(std::shared_ptr<TableJoin> analyzed_join) const;
|
|
|
|
/// Get result type for function "joinGet(OrNull)"
|
|
DataTypePtr joinGetCheckAndGetReturnType(const DataTypes & data_types, const String & column_name, bool or_null) const;
|
|
|
|
/// Execute function "joinGet(OrNull)" on data block.
|
|
/// Takes rwlock for read to prevent parallel StorageJoin updates during processing data block
|
|
/// (but not during processing whole query, it's safe for joinGet that doesn't involve `used_flags` from HashJoin)
|
|
ColumnWithTypeAndName joinGet(const Block & block, const Block & block_with_columns_to_add) const;
|
|
|
|
BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, ContextPtr context) override;
|
|
|
|
Pipe read(
|
|
const Names & column_names,
|
|
const StorageMetadataPtr & /*metadata_snapshot*/,
|
|
SelectQueryInfo & query_info,
|
|
ContextPtr context,
|
|
QueryProcessingStage::Enum processed_stage,
|
|
size_t max_block_size,
|
|
unsigned num_streams) override;
|
|
|
|
std::optional<UInt64> totalRows(const Settings & settings) const override;
|
|
std::optional<UInt64> totalBytes(const Settings & settings) const override;
|
|
|
|
private:
|
|
Block sample_block;
|
|
const Names key_names;
|
|
bool use_nulls;
|
|
SizeLimits limits;
|
|
ASTTableJoin::Kind kind; /// LEFT | INNER ...
|
|
ASTTableJoin::Strictness strictness; /// ANY | ALL
|
|
bool overwrite;
|
|
|
|
std::shared_ptr<TableJoin> table_join;
|
|
HashJoinPtr join;
|
|
|
|
/// Protect state for concurrent use in insertFromBlock and joinBlock.
|
|
/// Lock is stored in HashJoin instance during query and blocks concurrent insertions.
|
|
mutable std::shared_mutex rwlock;
|
|
mutable std::mutex mutate_mutex;
|
|
|
|
void insertBlock(const Block & block) override;
|
|
void finishInsert() override {}
|
|
size_t getSize() const override;
|
|
|
|
protected:
|
|
StorageJoin(
|
|
DiskPtr disk_,
|
|
const String & relative_path_,
|
|
const StorageID & table_id_,
|
|
const Names & key_names_,
|
|
bool use_nulls_,
|
|
SizeLimits limits_,
|
|
ASTTableJoin::Kind kind_,
|
|
ASTTableJoin::Strictness strictness_,
|
|
const ColumnsDescription & columns_,
|
|
const ConstraintsDescription & constraints_,
|
|
const String & comment,
|
|
bool overwrite,
|
|
bool persistent_);
|
|
};
|
|
|
|
}
|