QueryOptimiser Class Reference

#include <queryoptimiser.h>

Collaboration diagram for QueryOptimiser:

List of all members.

Public Member Functions

QueryOptimiser (const Xapian::Database::Internal &db_, LocalSubMatch &localsubmatch_, MultiMatch *matcher_)

PostList * optimise_query (const Xapian::Query::Internal *query)

Xapian::termcount get_total_subqueries () const

Private Member Functions

PostList * do_subquery (const Xapian::Query::Internal *query, double factor)

Optimise a Xapian::Query::Internal subtree into a PostList subtree.

PostList * do_and_like (const Xapian::Query::Internal *query, double factor)

Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.

void do_and_like (const Xapian::Query::Internal *query, double factor, std::vector< PostList * > &and_plists, std::list< PosFilter > &pos_filters)

Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.

PostList * do_or_like (const Xapian::Query::Internal *query, double factor)

Optimise an OR-like Xapian::Query::Internal subtree into a PostList subtree.

PostList * do_synonym (const Xapian::Query::Internal *query, double factor)

Optimise a synonym Xapian::Query::Internal subtree into a PostList.

Private Attributes

const Xapian::Database::Internal & db

Xapian::doccount db_size

LocalSubMatch & localsubmatch

MultiMatch * matcher

Xapian::termcount total_subqs

How many leaf subqueries there are.

Detailed Description

Definition at line 38 of file queryoptimiser.h.

Constructor & Destructor Documentation

QueryOptimiser::QueryOptimiser	(	const Xapian::Database::Internal &	db_,
		LocalSubMatch &	localsubmatch_,
		MultiMatch *	matcher_
	)			`[inline]`

Definition at line 108 of file queryoptimiser.h.

Member Function Documentation

void QueryOptimiser::do_and_like	(	const Xapian::Query::Internal *	query,
		double	factor,
		std::vector< PostList * > &	and_plists,
		std::list< PosFilter > &	pos_filters
	)			`[private]`

Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.

Parameters:

	query	The subtree to optimise.
	factor	How much to scale weights for this subtree by.
	and_plists	Append new PostList subtrees to be combined with AND to this vector.
	pos_filters	Append any positional filters to be applied to the tree to this list.

Definition at line 224 of file queryoptimiser.cc.

References Assert, AssertRel, db, do_and_like(), do_subquery(), Xapian::Database::Internal::has_positions(), is_and_like(), LOGCALL_VOID, Xapian::Query::Internal::op, Xapian::Query::OP_AND, Xapian::Query::OP_FILTER, Xapian::Query::OP_NEAR, Xapian::Query::OP_PHRASE, Xapian::Query::Internal::parameter, and Xapian::Query::Internal::subqs.

PostList * QueryOptimiser::do_and_like	(	const Xapian::Query::Internal *	query,
		double	factor
	)			`[private]`

Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.

Parameters:

	query	The subtree to optimise.
	factor	How much to scale weights for this subtree by.

Returns:: A PostList subtree.

Definition at line 179 of file queryoptimiser.cc.

References AssertEq, AssertRel, PosFilter::begin, db_size, PosFilter::end, LOGCALL, matcher, PosFilter::op, Xapian::Query::OP_NEAR, Xapian::Query::OP_PHRASE, RETURN, and PosFilter::window.

Referenced by do_and_like(), and do_subquery().

PostList * QueryOptimiser::do_or_like	(	const Xapian::Query::Internal *	query,
		double	factor
	)			`[private]`

Optimise an OR-like Xapian::Query::Internal subtree into a PostList subtree.

Parameters:

	query	The subtree to optimise.
	factor	How much to scale weights for this subtree by.

Returns:: A PostList subtree.

Definition at line 332 of file queryoptimiser.cc.

References Assert, AssertRel, db_size, do_subquery(), LOGCALL, matcher, Xapian::Query::Internal::op, Xapian::Query::OP_ELITE_SET, Xapian::Query::OP_OR, Xapian::Query::OP_SYNONYM, Xapian::Query::OP_XOR, Xapian::Query::Internal::parameter, Xapian::PostingIterator::Internal::recalc_maxweight(), RETURN, and Xapian::Query::Internal::subqs.

Referenced by do_subquery(), and do_synonym().

PostList * QueryOptimiser::do_subquery	(	const Xapian::Query::Internal *	query,
		double	factor
	)			`[private]`

Optimise a Xapian::Query::Internal subtree into a PostList subtree.

Parameters:

	query	The subtree to optimise.
	factor	How much to scale weights for this subtree by.

Returns:: A PostList subtree.

Definition at line 52 of file queryoptimiser.cc.

Referenced by do_and_like(), do_or_like(), and optimise_query().

PostList * QueryOptimiser::do_synonym	(	const Xapian::Query::Internal *	query,
		double	factor
	)			`[private]`

Optimise a synonym Xapian::Query::Internal subtree into a PostList.

Parameters:

	query	The subtree to optimise.
	factor	How much to scale weights for this subtree by.

Returns:: A PostList subtree.

Definition at line 419 of file queryoptimiser.cc.

References AssertEq, do_or_like(), Xapian::Query::Internal::get_wqf(), localsubmatch, LOGCALL, LocalSubMatch::make_synonym_postlist(), matcher, and RETURN.

Referenced by do_subquery().

Xapian::termcount QueryOptimiser::get_total_subqueries ( ) const [inline]

Definition at line 118 of file queryoptimiser.h.

References total_subqs.

Referenced by LocalSubMatch::get_postlist_and_term_info().

PostList* QueryOptimiser::optimise_query ( const Xapian::Query::Internal * query ) [inline]

Definition at line 114 of file queryoptimiser.h.

References do_subquery().

Referenced by LocalSubMatch::get_postlist_and_term_info().

Member Data Documentation

const Xapian::Database::Internal& QueryOptimiser::db [private]

Definition at line 39 of file queryoptimiser.h.

Referenced by do_and_like(), and do_subquery().

Xapian::doccount QueryOptimiser::db_size [private]

Definition at line 41 of file queryoptimiser.h.

Referenced by do_and_like(), do_or_like(), and do_subquery().

LocalSubMatch& QueryOptimiser::localsubmatch [private]

Definition at line 43 of file queryoptimiser.h.

Referenced by do_subquery(), and do_synonym().

MultiMatch* QueryOptimiser::matcher [private]

Definition at line 45 of file queryoptimiser.h.

Referenced by do_and_like(), do_or_like(), do_subquery(), and do_synonym().

Xapian::termcount QueryOptimiser::total_subqs [private]

How many leaf subqueries there are.

Used for scaling percentages when the highest weighted document doesn't "match all terms".

Definition at line 52 of file queryoptimiser.h.

Referenced by do_subquery(), and get_total_subqueries().

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

matcher/queryoptimiser.h
matcher/queryoptimiser.cc


Public Member Functions
	QueryOptimiser (const Xapian::Database::Internal &db_, LocalSubMatch &localsubmatch_, MultiMatch *matcher_)
PostList *	optimise_query (const Xapian::Query::Internal *query)
Xapian::termcount	get_total_subqueries () const
Private Member Functions
PostList *	do_subquery (const Xapian::Query::Internal *query, double factor)
	Optimise a Xapian::Query::Internal subtree into a PostList subtree.
PostList *	do_and_like (const Xapian::Query::Internal *query, double factor)
	Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.
void	do_and_like (const Xapian::Query::Internal query, double factor, std::vector< PostList > &and_plists, std::list< PosFilter > &pos_filters)
	Optimise an AND-like Xapian::Query::Internal subtree into a PostList subtree.
PostList *	do_or_like (const Xapian::Query::Internal *query, double factor)
	Optimise an OR-like Xapian::Query::Internal subtree into a PostList subtree.
PostList *	do_synonym (const Xapian::Query::Internal *query, double factor)
	Optimise a synonym Xapian::Query::Internal subtree into a PostList.
Private Attributes
const Xapian::Database::Internal &	db
Xapian::doccount	db_size
LocalSubMatch &	localsubmatch
MultiMatch *	matcher
Xapian::termcount	total_subqs
	How many leaf subqueries there are.