The arrow chunk reader for vertex property group. More...

#include <chunk_reader.h>

Public Member Functions
	VertexPropertyArrowChunkReader (const std::shared_ptr< VertexInfo > &vertex_info, const std::shared_ptr< PropertyGroup > &property_group, const std::string &prefix, const util::FilterOptions &options={})
	Initialize the VertexPropertyArrowChunkReader. More...

Status	seek (IdType id)
	Sets chunk position indicator for reader by internal vertex id. If internal vertex id is not found, will return Status::IndexError error. After seeking to an invalid vertex id, the next call to GetChunk function may undefined, e.g. return an non exist path. More...

Result< std::shared_ptr< arrow::Table > >	GetChunk ()
	Return the current arrow chunk table of chunk position indicator.

Status	next_chunk ()
	Sets chunk position indicator to next chunk. More...

IdType	GetChunkNum () const noexcept
	Get the chunk number of current vertex property group.

void	Filter (util::Filter filter=nullptr)
	Apply the row filter to the table. No parameter call Filter() will clear the filter. More...

void	Select (util::ColumnNames column_names=std::nullopt)
	Apply the projection to the table to be read. No parameter call Select() will clear the projection. More...

Static Public Member Functions
static Result< std::shared_ptr< VertexPropertyArrowChunkReader > >	Make (const std::shared_ptr< VertexInfo > &vertex_info, const std::shared_ptr< PropertyGroup > &property_group, const std::string &prefix, const util::FilterOptions &options={})
	Create a VertexPropertyArrowChunkReader instance from vertex info. More...

static Result< std::shared_ptr< VertexPropertyArrowChunkReader > >	Make (const std::shared_ptr< GraphInfo > &graph_info, const std::string &label, const std::shared_ptr< PropertyGroup > &property_group, const util::FilterOptions &options={})
	Create a VertexPropertyArrowChunkReader instance from graph info and property group. More...

static Result< std::shared_ptr< VertexPropertyArrowChunkReader > >	Make (const std::shared_ptr< GraphInfo > &graph_info, const std::string &label, const std::string &property_name, const util::FilterOptions &options={})
	Create a VertexPropertyArrowChunkReader instance from graph info and property name. More...

Detailed Description

The arrow chunk reader for vertex property group.

Definition at line 42 of file chunk_reader.h.

Constructor & Destructor Documentation

◆ VertexPropertyArrowChunkReader()

graphar::VertexPropertyArrowChunkReader::VertexPropertyArrowChunkReader	(	const std::shared_ptr< VertexInfo > &	vertex_info,
		const std::shared_ptr< PropertyGroup > &	property_group,
		const std::string &	prefix,
		const util::FilterOptions &	options = `{}`
	)

Initialize the VertexPropertyArrowChunkReader.

Parameters

vertex_info	The vertex info that describes the vertex type.
property_group	The property group that describes the property group.
prefix	The absolute prefix.

Definition at line 128 of file chunk_reader.cc.

Member Function Documentation

◆ Filter()

void graphar::VertexPropertyArrowChunkReader::Filter ( util::Filter filter = nullptr )

Apply the row filter to the table. No parameter call Filter() will clear the filter.

Parameters

filter Predicate expression to filter rows.

Definition at line 201 of file chunk_reader.cc.

◆ Make() [1/3]

Result< std::shared_ptr< VertexPropertyArrowChunkReader > > graphar::VertexPropertyArrowChunkReader::Make	(	const std::shared_ptr< GraphInfo > &	graph_info,
		const std::string &	label,
		const std::shared_ptr< PropertyGroup > &	property_group,
		const util::FilterOptions &	options = `{}`
	)

static

Create a VertexPropertyArrowChunkReader instance from graph info and property group.

Parameters

graph_info	The graph info.
label	The vertex label.
property_group	The property group of the vertex property.
options	The filter options, default is empty.

Definition at line 219 of file chunk_reader.cc.

◆ Make() [2/3]

Result< std::shared_ptr< VertexPropertyArrowChunkReader > > graphar::VertexPropertyArrowChunkReader::Make	(	const std::shared_ptr< GraphInfo > &	graph_info,
		const std::string &	label,
		const std::string &	property_name,
		const util::FilterOptions &	options = `{}`
	)

static

Create a VertexPropertyArrowChunkReader instance from graph info and property name.

Parameters

graph_info	The graph info.
label	The vertex label.
property_name	The name of one property in the property group you want to read.
options	The filter options, default is empty.

Definition at line 233 of file chunk_reader.cc.

◆ Make() [3/3]

Result< std::shared_ptr< VertexPropertyArrowChunkReader > > graphar::VertexPropertyArrowChunkReader::Make	(	const std::shared_ptr< VertexInfo > &	vertex_info,
		const std::shared_ptr< PropertyGroup > &	property_group,
		const std::string &	prefix,
		const util::FilterOptions &	options = `{}`
	)

static

Create a VertexPropertyArrowChunkReader instance from vertex info.

Parameters

vertex_info	The vertex info.
property_group	The property group of the vertex property.
prefix	The absolute prefix of the graph.
options	The filter options, default is empty.

Definition at line 210 of file chunk_reader.cc.

◆ next_chunk()

Status graphar::VertexPropertyArrowChunkReader::next_chunk ( )

Sets chunk position indicator to next chunk.

if current chunk is the last chunk, will return Status::IndexError error.

Definition at line 189 of file chunk_reader.cc.

◆ seek()

Status graphar::VertexPropertyArrowChunkReader::seek ( IdType id )

Sets chunk position indicator for reader by internal vertex id. If internal vertex id is not found, will return Status::IndexError error. After seeking to an invalid vertex id, the next call to GetChunk function may undefined, e.g. return an non exist path.

Parameters

id	the vertex id.

Definition at line 151 of file chunk_reader.cc.

◆ Select()

void graphar::VertexPropertyArrowChunkReader::Select ( util::ColumnNames column_names = std::nullopt )

Apply the projection to the table to be read. No parameter call Select() will clear the projection.

Parameters

column_names The name of columns to be selected.

Definition at line 205 of file chunk_reader.cc.

The documentation for this class was generated from the following files:

src/graphar/arrow/chunk_reader.h
src/graphar/arrow/chunk_reader.cc

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ VertexPropertyArrowChunkReader()

Member Function Documentation

◆ Filter()

◆ Make() [1/3]

◆ Make() [2/3]

◆ Make() [3/3]

◆ next_chunk()

◆ seek()

◆ Select()