m::Query Struct Reference

A Query in a QueryGraph is a DataSource that represents a nested query. More...

#include <QueryGraph.hpp>

Inheritance diagram for m::Query:

Collaboration diagram for m::Query:

Public Member Functions
QueryGraph &	query_graph () const
	Returns a reference to the internal QueryGraph.
ThreadSafePooledOptionalString	name () const override
	Returns the name of this DataSource.
bool	is_correlated () const override
	Returns true iff the data source is correlated.
std::size_t	id () const
	Returns the id of this DataSource.
const ThreadSafePooledOptionalString &	alias () const
	Returns the alias 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.
bool	operator== (const DataSource &other) const
bool	operator!= (const DataSource &other) const

Private Member Functions
	Query (std::size_t id, ThreadSafePooledOptionalString alias, std::unique_ptr< QueryGraph > query_graph)
void	remove_join (Join &join)

Private Attributes
std::unique_ptr< QueryGraph >	query_graph_
	query graph of the sub-query
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

Detailed Description

A Query in a QueryGraph is a DataSource that represents a nested query.

As such, a Query contains a QueryGraph. A Query must be evaluated to acquire its sequence of tuples.

Definition at line 115 of file QueryGraph.hpp.

Constructor & Destructor Documentation

Query()

m::Query::Query ( std::size_t  id, ThreadSafePooledOptionalString  alias, std::unique_ptr< QueryGraph >  query_graph  )

inlineprivate

Definition at line 123 of file QueryGraph.hpp.

Member Function Documentation

add_join()

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

inlineinherited

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

inlineinherited

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

inlineinherited

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

inlineinherited

Returns the id of this DataSource.

Definition at line 56 of file QueryGraph.hpp.

is_correlated()

bool Query::is_correlated ( ) const

overridevirtual

Returns true iff the data source is correlated.

Implements m::DataSource.

Definition at line 21 of file QueryGraph.cpp.

References query_graph_.

joins()

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

inlineinherited

Returns a reference to the Joins using this DataSource.

Definition at line 69 of file QueryGraph.hpp.

name()

ThreadSafePooledOptionalString m::Query::name ( ) const

inlineoverridevirtual

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).

Implements m::DataSource.

Definition at line 131 of file QueryGraph.hpp.

operator!=()

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

inlineinherited

Definition at line 84 of file QueryGraph.hpp.

operator==()

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

inlineinherited

Definition at line 83 of file QueryGraph.hpp.

References m::DataSource::id_.

query_graph()

QueryGraph & m::Query::query_graph ( ) const

inline

Returns a reference to the internal QueryGraph.

Definition at line 129 of file QueryGraph.hpp.

remove_join()

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

inlineprivateinherited

Definition at line 75 of file QueryGraph.hpp.

update_filter()

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

inlineinherited

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

QueryGraph

friend struct QueryGraph

friend

Definition at line 117 of file QueryGraph.hpp.

Field Documentation

alias_

ThreadSafePooledOptionalString m::DataSource::alias_

privateinherited

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

privateinherited

indicates whether this source is already decorrelated

Definition at line 44 of file QueryGraph.hpp.

filter_

cnf::CNF m::DataSource::filter_

privateinherited

filter condition on this data source

Definition at line 39 of file QueryGraph.hpp.

id_

std::size_t m::DataSource::id_

privateinherited

unique identifier of this data source within its query graph

Definition at line 42 of file QueryGraph.hpp.

Referenced by m::DataSource::operator==().

joins_

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

privateinherited

joins with this data source

Definition at line 40 of file QueryGraph.hpp.

query_graph_

std::unique_ptr<QueryGraph> m::Query::query_graph_

private

query graph of the sub-query

Definition at line 120 of file QueryGraph.hpp.

Referenced by is_correlated().

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

• include/mutable/IR/QueryGraph.hpp
• src/IR/QueryGraph.cpp