QueryOptimiser Class Reference

#include <queryoptimiser.h>

Collaboration diagram for QueryOptimiser:

[legend]List of all members.

Public Member Functions
	QueryOptimiser (const Xapian::Database::Internal &db_, LocalSubMatch &localsubmatch_, MultiMatch *matcher_)
PostList *	optimise_query (Xapian::Query::Internal *query)
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_leaf (const Xapian::Query::Internal *query, double factor)
	Optimise a leaf Xapian::Query::Internal subtree into a PostList.
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.
Private Attributes
const Xapian::Database::Internal &	db
Xapian::doccount	db_size
LocalSubMatch &	localsubmatch
MultiMatch *	matcher

---

Detailed Description

Definition at line 39 of file queryoptimiser.h.

---

Constructor & Destructor Documentation

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

Definition at line 105 of file queryoptimiser.h.

---

Member Function Documentation

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.

References Assert, AssertEq, db, db_size, DEBUGCALL, do_and_like(), do_leaf(), do_or_like(), matcher, Xapian::Query::OP_AND, Xapian::Query::OP_AND_MAYBE, Xapian::Query::OP_AND_NOT, Xapian::Query::OP_ELITE_SET, Xapian::Query::OP_FILTER, Xapian::Query::Internal::OP_LEAF, Xapian::Query::OP_NEAR, Xapian::Query::OP_OR, Xapian::Query::OP_PHRASE, Xapian::Query::OP_SCALE_WEIGHT, Xapian::Query::OP_VALUE_GE, Xapian::Query::OP_VALUE_LE, Xapian::Query::OP_VALUE_RANGE, Xapian::Query::OP_XOR, query(), and RETURN.

Referenced by do_or_like(), and optimise_query().

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

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

Parameters:

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

Returns:

A PostList.

Definition at line 65 of file queryoptimiser.h.

References Xapian::Query::empty(), localsubmatch, LocalSubMatch::postlist_from_op_leaf_query(), and query().

Referenced by do_subquery().

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 135 of file queryoptimiser.cc.

References AssertEq, AssertRel, db_size, DEBUGCALL, matcher, Xapian::Query::OP_NEAR, Xapian::Query::OP_PHRASE, query(), and RETURN.

Referenced by do_subquery().

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.

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 288 of file queryoptimiser.cc.

References Assert, AssertRel, db_size, DEBUGCALL, do_subquery(), matcher, Xapian::Query::OP_ELITE_SET, Xapian::Query::OP_OR, Xapian::Query::OP_XOR, query(), Xapian::PostingIterator::Internal::recalc_maxweight(), and RETURN.

Referenced by do_subquery().

PostList* QueryOptimiser::optimise_query

(

Xapian::Query::Internal *

query

)

[inline]

Definition at line 111 of file queryoptimiser.h.

References do_subquery(), and query().

---

Member Data Documentation

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

Definition at line 40 of file queryoptimiser.h.

Referenced by do_subquery().

Xapian::doccount QueryOptimiser::db_size [private]

Definition at line 42 of file queryoptimiser.h.

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

LocalSubMatch& QueryOptimiser::localsubmatch [private]

Definition at line 44 of file queryoptimiser.h.

Referenced by do_leaf().

MultiMatch* QueryOptimiser::matcher [private]

Definition at line 46 of file queryoptimiser.h.

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

---

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

• matcher/queryoptimiser.h
• matcher/queryoptimiser.cc

---