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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 # @return [RDF::Query::Solutions] # the resulting solution sequence # @see http://www.w3.org/TR/rdf-sparql-query/#sparqlAlgebra def execute(queryable, options = {}) debug(options) {"Distinct"} @solutions = operands.last.execute(queryable, options.merge(:depth => options[:depth].to_i + 1)) debug(options) {"=>(before) #{@solutions.inspect}"} @solutions = @solutions.distinct debug(options) {"=>(after) #{@solutions.inspect}"} @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
19 entries across 19 versions & 1 rubygems