mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 19:02:04 +00:00
c52b8ec083
Introduced MergeTask and MutateTask
85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
#pragma once
|
|
|
|
#include <optional>
|
|
#include <vector>
|
|
#include <memory>
|
|
#include <unordered_map>
|
|
|
|
#include <common/shared_ptr_helper.h>
|
|
#include <Parsers/ASTAlterQuery.h>
|
|
#include <Storages/IStorage_fwd.h>
|
|
#include <DataTypes/IDataType.h>
|
|
#include <Core/Names.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class Context;
|
|
class WriteBuffer;
|
|
class ReadBuffer;
|
|
|
|
/// Represents set of actions which should be applied
|
|
/// to values from set of columns which satisfy predicate.
|
|
struct MutationCommand
|
|
{
|
|
ASTPtr ast; /// The AST of the whole command
|
|
|
|
enum Type
|
|
{
|
|
EMPTY, /// Not used.
|
|
DELETE,
|
|
UPDATE,
|
|
MATERIALIZE_INDEX,
|
|
MATERIALIZE_PROJECTION,
|
|
READ_COLUMN, /// Read column and apply conversions (MODIFY COLUMN alter query).
|
|
DROP_COLUMN,
|
|
DROP_INDEX,
|
|
DROP_PROJECTION,
|
|
MATERIALIZE_TTL,
|
|
RENAME_COLUMN,
|
|
MATERIALIZE_COLUMN,
|
|
};
|
|
|
|
Type type = EMPTY;
|
|
|
|
/// WHERE part of mutation
|
|
ASTPtr predicate;
|
|
|
|
/// Columns with corresponding actions
|
|
std::unordered_map<String, ASTPtr> column_to_update_expression;
|
|
|
|
/// For MATERIALIZE INDEX and PROJECTION
|
|
String index_name;
|
|
String projection_name;
|
|
|
|
/// For MATERIALIZE INDEX, UPDATE and DELETE.
|
|
ASTPtr partition;
|
|
|
|
/// For reads, drops and etc.
|
|
String column_name;
|
|
DataTypePtr data_type; /// Maybe empty if we just want to drop column
|
|
|
|
/// We need just clear column, not drop from metadata.
|
|
bool clear = false;
|
|
|
|
/// Column rename_to
|
|
String rename_to;
|
|
|
|
/// If parse_alter_commands, than consider more Alter commands as mutation commands
|
|
static std::optional<MutationCommand> parse(ASTAlterCommand * command, bool parse_alter_commands = false);
|
|
};
|
|
|
|
/// Multiple mutation commands, possible from different ALTER queries
|
|
class MutationCommands : public shared_ptr_helper<MutationCommands>, public std::vector<MutationCommand>
|
|
{
|
|
public:
|
|
std::shared_ptr<ASTExpressionList> ast() const;
|
|
|
|
void writeText(WriteBuffer & out) const;
|
|
void readText(ReadBuffer & in);
|
|
};
|
|
|
|
using MutationCommandsConstPtr = std::shared_ptr<MutationCommands>;
|
|
|
|
}
|