hybridse::vm::PartitionHandler

#include <catalog.h>

The abstraction of partition dataset operation.

Summary

class hybridse::vm::PartitionHandler;

The abstraction of partition dataset operation.

A partition dataset is always organized by segments +– key1 --> segment1 partition –+– key2 --> segment2 +– key3 --> segment3

Public functions
PartitionHandler()
~PartitionHandler()
GetIterator()	std::unique_ptr< RowIterator >
GetRawIterator()	RowIterator *
GetWindowIterator(const std::string & idx_name)	std::unique_ptr< WindowIterator >
GetWindowIterator() =0	std::unique_ptr< WindowIterator >
GetHanlderType() override	const HandlerType Return HandlerType::kPartitionHandler by default.
At(uint64_t pos)	Row Return empty row, cause partition dataset does not support At operation.
GetSegment(const std::string & key)	std::shared_ptr< TableHandler >
GetSegments(const std::vector< std::string > & keys)	std::vector< std::shared_ptr< TableHandler > >
GetHandlerTypeName() override	const std::string Return the name of handler, and return "PartitionHandler" by default.
GetOrderType() const	const OrderType

Inherited members

Inherited by hybridse::vm::MemPartitionHandler

Inherited from hybridse::vm::TableHandler

Inherited Public functions
TableHandler()
~TableHandler()
GetTypes() =0	const Types & Return table column Types information.
GetIndex() =0	const IndexHint & Return the index information.
GetPartition(const std::string & index_name)	std::shared_ptr< PartitionHandler >
GetTablet(const std::string & index_name, const std::string & pk)	std::shared_ptr< Tablet >
GetTablet(const std::string & index_name, const std::vector< std::string > & pks)	std::shared_ptr< Tablet >

Inherited from hybridse::vm::DataHandler

Inherited Public functions
DataHandler()
~DataHandler()
GetSchema() =0	const Schema * Return table schema.
GetName() =0	const std::string & Return table name.
GetDatabase() =0	const std::string & Return the name of database.
GetStatus()	base::Status Return dataset status. Default is hybridse::common::kOk.

Inherited from hybridse::codec::ListV< Row >

Inherited Public functions
ListV()
~ListV()
GetCount()	const uint64_t Returns the number of elements in this list.

Public Functions

function PartitionHandler

inline PartitionHandler()

function ~PartitionHandler

inline ~PartitionHandler()

function GetIterator

inline virtual std::unique_ptr< RowIterator > GetIterator()

Reimplements: hybridse::codec::ListV::GetIterator

Return the iterator of row iterator. Return null by default

function GetRawIterator

inline virtual RowIterator * GetRawIterator()

Reimplements: hybridse::codec::ListV::GetRawIterator

Return the iterator of row iterator Return null by default

function GetWindowIterator

inline virtual std::unique_ptr< WindowIterator > GetWindowIterator(
    const std::string & idx_name
)

Reimplements: hybridse::vm::TableHandler::GetWindowIterator

Return WindowIterator so that user can use it to iterate datasets segment by segment.

function GetWindowIterator

virtual std::unique_ptr< WindowIterator > GetWindowIterator() =0

Reimplemented by: hybridse::vm::MemPartitionHandler::GetWindowIterator

Return WindowIterator to iterate datasets segment-by-segment.

function GetHanlderType

inline virtual const HandlerType GetHanlderType() override

Return HandlerType::kPartitionHandler by default.

Reimplements: hybridse::vm::TableHandler::GetHanlderType

function At

inline virtual Row At(
    uint64_t pos
)

Return empty row, cause partition dataset does not support At operation.

Reimplements: hybridse::codec::ListV::At

function GetSegment

inline virtual std::shared_ptr< TableHandler > GetSegment(
    const std::string & key
)

Reimplemented by: hybridse::vm::MemPartitionHandler::GetSegment

Return Return table handler of specific segment binding to given key. Return null by default.

function GetSegments

inline virtual std::vector< std::shared_ptr< TableHandler > > GetSegments(
    const std::vector< std::string > & keys
)

Return a sequence of table handles of specify segments binding to given keys set.

function GetHandlerTypeName

inline virtual const std::string GetHandlerTypeName() override

Return the name of handler, and return "PartitionHandler" by default.

Reimplements: hybridse::vm::TableHandler::GetHandlerTypeName

Reimplemented by: hybridse::vm::MemPartitionHandler::GetHandlerTypeName

function GetOrderType

inline virtual const OrderType GetOrderType() const

Reimplements: hybridse::vm::TableHandler::GetOrderType

Reimplemented by: hybridse::vm::MemPartitionHandler::GetOrderType

Return order type of the dataset, and return kNoneOrder by default.