NAME

DiaColloDB::Relation::TDF::Query - collocation db, profiling relation: PDL: query hacks

SYNOPSIS

 ##========================================================================
 ## PRELIMINARIES
 
 use DiaColloDB::Relation::TDF::Query;
 
 ##========================================================================
 ## Constructors etc.
 
 $vq = CLASS_OR_OBJECT->new(%args);
 
 ##========================================================================
 ## API: compilation
 
 $vq_or_undef = $vq->compile(%opts);
 $vq_or_undef = $vq->compileLocal(%opts);
 $vq_or_undef = $vq->compileOptions(%opts);
 
 ##========================================================================
 ## Utils: set operations
 
 $vq = $vq->_intersect($vq2);
 $vq = $vq->_union($vq2);
 
 ##========================================================================
 ## Wrappers: DDC::XS::Object
 
 $vq = $DDC_XS_OBJECT->__dcvs_compile($vq,%opts);

DESCRIPTION

DiaColloDB::Relation::TDF::Query provides an object-oriented interface for parsing and evaluating queries in DDC syntax with respect to a sparse (term x document) frequency index as represented by a DiaColloDB::Relation::TDF object.

Globals & Constants

Variable: @ISA

DiaColloDB::Relation::TDF::Query inherits from DiaColloDB::Logger.

Constructors etc.

new

 $vq = CLASS_OR_OBJECT->new(%args);
 $vq = CLASS_OR_OBJECT->new($cquery);

Create and return a new tdf-query object from a parsed DDC::XS::CQuery object. %args, %$vq:

 cq => $cquery,      ##-- underlying DDC::XS::CQuery object
 ti => $ti_pdl,      ##-- pdl ($NTi) : selected term-indices (undef: all)
 ci => $ci_pdl,      ##-- pdl ($NCi) : selected cat-indices (undef: all)

API: compilation

compile

 $vq_or_undef = $vq->compile(%opts);

Wraps $vq->compileLocal(). %opts: as for DiaColloDB::profile(), also

 coldb => $coldb,   ##-- DiaColloDB context (for enums)
 tdf   => $tdf,     ##-- DiaColloDB::Relation::TDF context (for meta-enums)

compileLocal

 $vq_or_undef = $vq->compileLocal(%opts);

Calls $vq->{cq}->__dcvs_compile($vq,%opts) to compile the query conditions into $vq->{ti} and $vq->{ci}, followed by $vq->compileOptions(). %opts: as for DiaColloDB::profile(), also:

 coldb => $coldb,   ##-- DiaColloDB context (for enums)
 tdf  => $tdf,      ##-- DiaColloDB::Relation::TDF context (for meta-enums)

compileOptions

 $vq_or_undef = $vq->compileOptions(%opts);

merges underlying DDC::XS::CQueryOptions restrictions into $vq piddles. %opts: as for the compile() method.

Utils: set operations

_intersect

 $vq = $vq->_intersect($vq2);

destructive intersection on component piddles.

_union

 $vq = $vq->_union($vq2);

destructive union on component piddles.

Wrappers: DDC::XS::Object

The DiaColloDB::Relation::TDF::Query package extends the DDC::XS::Object subclasses with additional methods for compiling DiaColloDB::Relation::TDF::Query objects from DDC::XS::CQuery and/or DDC::XS::CQFilter objects representing a fully parsed DDC query.

DDC::XS::Object::__dcvs_compile

 $vq = $DDC_XS_OBJECT->__dcvs_compile($vq,%opts);

Compiles $DDC_XS_OBJECT (a DDC::XS::Object) into a DiaColloDB::Relation::TDF::Query object $vq. Returns $vq on success, or undef on failure. %opts: as for DiaColloDB::Relation::TDF::Query::compile().

Supported subclasses:

DDC::XS::Object

Fallback method to report errors.

DDC::XS::CQTokAny

Dummy method for universal wildcard queries.

DDC::XS::CQTokExact

DDC::XS::CQTokInfl

Used for bareword queries, doesn't really support DDC-style re-inflection or term-expansion.

DDC::XS::CQTokSet

DDC::XS::CQTokSetInfl

Used for set-valued bareword queries, doesn't really support DDC-style re-inflection or term-expansion.

DDC::XS::CQTokRegex

DDC::XS::CQTokPrefix

DDC::XS::CQTokSuffix

DDC::XS::CQTokInfix

DDC::XS::CQTokPrefixSet

DDC::XS::CQTokSuffixSet

DDC::XS::CQTokInfixSet

DDC::XS::CQTokLemma

Used for %LEMMA lemma queries, doesn't really support DDC-style re-inflection or term-expansion.

DDC::XS::CQWith

DDC::XS::CQWithout

DDC::XS::CQAnd

Boolean conjunction operator evaluates to union of sub-query term-targets and the intersection of the sub-query category-targets, restricted to the corresponding term-teargets, so a query (A && B) behaves as a sparse matrix mapping each document d in any category c containing both A and B to f(A,d)+f(B,d).

TODO: make this restriction actually work on document (signature) level rather than category level, for better resolution.

DDC::XS::CQOr

DDC::XS::CQFHasFieldValue

DDC::XS::CQFHasFieldRegex

DDC::XS::CQueryOptions

Dispatch methods compiles filters.

AUTHOR

Bryan Jurish <moocow@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2015-2020 by Bryan Jurish

This package is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.14.2 or, at your option, any later version of Perl 5 you may have available.

SEE ALSO

DDC::XS::CQuery(3pm), DiaColloDB::Relation::TDF(3pm), DiaColloDB(3pm), perl(1), ...