m::DataSource Struct Reference

A DataSource in a QueryGraph. More...

#include <QueryGraph.hpp>

Inheritance diagram for m::DataSource:

Collaboration diagram for m::DataSource:

Public Member Functions
virtual	~DataSource ()
std::size_t	id () const
	Returns the id of this DataSource.
const ThreadSafePooledOptionalString &	alias () const
	Returns the alias of this DataSource.
virtual ThreadSafePooledOptionalString	name () const =0
	Returns the name of this DataSource.
const cnf::CNF &	filter () const
	Returns the filter of this DataSource.
void	update_filter (cnf::CNF filter)
	Adds filter to the current filter of this DataSource by logical conjunction.
void	add_join (Join &join)
	Adds join to the set of Joins of this DataSource.
const auto &	joins () const
	Returns a reference to the Joins using this DataSource.
virtual bool	is_correlated () const =0
	Returns true iff the data source is correlated.
bool	operator== (const DataSource &other) const
bool	operator!= (const DataSource &other) const

Protected Member Functions
	DataSource (std::size_t id, ThreadSafePooledOptionalString alias)

Private Member Functions
void	remove_join (Join &join)

Private Attributes
cnf::CNF	filter_
	filter condition on this data source
std::vector< std::reference_wrapper< Join > >	joins_
	joins with this data source
ThreadSafePooledOptionalString	alias_
	alias of this data source, may not have a value if this data source has no alias
std::size_t	id_
	unique identifier of this data source within its query graph
bool	decorrelated_ = true
	indicates whether this source is already decorrelated

Friends
struct	QueryGraph
struct	GraphBuilder
struct	Decorrelation

Detailed Description

A DataSource in a QueryGraph.

Represents something that can be evaluated to a sequence of tuples, optionally filtered by a filter condition. A DataSource can be joined with one or more other DataSources by a Join.

Definition at line 32 of file QueryGraph.hpp.

Constructor & Destructor Documentation

DataSource()

m::DataSource::DataSource ( std::size_t  id, ThreadSafePooledOptionalString  alias  )

inlineprotected

Definition at line 47 of file QueryGraph.hpp.

References and().

~DataSource()

virtual m::DataSource::~DataSource ( )

inlinevirtual

Definition at line 53 of file QueryGraph.hpp.

Member Function Documentation

add_join()

void m::DataSource::add_join ( Join &  join )

inline

Adds join to the set of Joins of this DataSource.

Definition at line 67 of file QueryGraph.hpp.

alias()

const ThreadSafePooledOptionalString & m::DataSource::alias ( ) const

inline

Returns the alias of this DataSource.

May not have a value.

Definition at line 58 of file QueryGraph.hpp.

filter()

const cnf::CNF & m::DataSource::filter ( ) const

inline

Returns the filter of this DataSource.

May be empty.

Definition at line 63 of file QueryGraph.hpp.

id()

std::size_t m::DataSource::id ( ) const

inline

Returns the id of this DataSource.

Definition at line 56 of file QueryGraph.hpp.

is_correlated()

virtual bool m::DataSource::is_correlated ( ) const

pure virtual

Returns true iff the data source is correlated.

Implemented in m::BaseTable, and m::Query.

joins()

const auto & m::DataSource::joins ( ) const

inline

Returns a reference to the Joins using this DataSource.

Definition at line 69 of file QueryGraph.hpp.

name()

virtual ThreadSafePooledOptionalString m::DataSource::name ( ) const

pure virtual

Returns the name of this DataSource.

Either the same as alias(), if an alias is given, otherwise the name of the referenced Table. Returned value might be empty for anonymous nested queries (e.g. in a WHERE clause).

Implemented in m::BaseTable, and m::Query.

Referenced by emplace_back_unique().

operator!=()

bool m::DataSource::operator!= ( const DataSource &  other ) const

inline

Definition at line 84 of file QueryGraph.hpp.

operator==()

bool m::DataSource::operator== ( const DataSource &  other ) const

inline

Definition at line 83 of file QueryGraph.hpp.

References id_.

remove_join()

void m::DataSource::remove_join ( Join &  join )

inlineprivate

Definition at line 75 of file QueryGraph.hpp.

update_filter()

void m::DataSource::update_filter ( cnf::CNF  filter )

inline

Adds filter to the current filter of this DataSource by logical conjunction.

Definition at line 65 of file QueryGraph.hpp.

References and().

Referenced by m::QueryGraph::add_custom_filter().

Friends And Related Function Documentation

Decorrelation

friend struct Decorrelation

friend

Definition at line 36 of file QueryGraph.hpp.

GraphBuilder

friend struct GraphBuilder

friend

Definition at line 35 of file QueryGraph.hpp.

QueryGraph

friend struct QueryGraph

friend

Definition at line 34 of file QueryGraph.hpp.

Field Documentation

alias_

ThreadSafePooledOptionalString m::DataSource::alias_

private

alias of this data source, may not have a value if this data source has no alias

Definition at line 41 of file QueryGraph.hpp.

decorrelated_

bool m::DataSource::decorrelated_ = true

private

indicates whether this source is already decorrelated

Definition at line 44 of file QueryGraph.hpp.

filter_

cnf::CNF m::DataSource::filter_

private

filter condition on this data source

Definition at line 39 of file QueryGraph.hpp.

id_

std::size_t m::DataSource::id_

private

unique identifier of this data source within its query graph

Definition at line 42 of file QueryGraph.hpp.

Referenced by operator==().

joins_

std::vector<std::reference_wrapper<Join> > m::DataSource::joins_

private

joins with this data source

Definition at line 40 of file QueryGraph.hpp.

---

The documentation for this struct was generated from the following file:

• include/mutable/IR/QueryGraph.hpp