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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL GraphPattern `distinct` operator.
#
# @example
# (prefix ((xsd: <http://www.w3.org/2001/XMLSchema#>)
# (: <http://example/>))
# (distinct
# (project (?v)
# (bgp (triple ?x ?p ?v)))))
#
# @see http://www.w3.org/TR/rdf-sparql-query/#sparqlAlgebra
class Distinct < Operator::Unary
include Query
NAME = [:distinct]
##
# Executes this query on the given `queryable` graph or repository.
# Removes duplicate solutions from the solution set.
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @yield [solution]
# each matching solution
# @yieldparam [RDF::Query::Solution] solution
# @yieldreturn [void] ignored
# @return [RDF::Query::Solutions]
# the resulting solution sequence
# @see http://www.w3.org/TR/rdf-sparql-query/#sparqlAlgebra
def execute(queryable, options = {}, &block)
@solutions = queryable.query(operands.last, options.merge(:depth => options[:depth].to_i + 1)).distinct
@solutions.each(&block) if block_given?
@solutions
end
##
# Returns an optimized version of this query.
#
# Return optimized query
#
# @return [Union, RDF::Query] `self`
def optimize
operands = operands.map(&:optimize)
end
end # Distinct
end # Operator
end; end # SPARQL::Algebra
Version data entries
5 entries across 5 versions & 1 rubygems