Class: SPARQL::Algebra::Operator::Project
- Inherits:
-
Binary
- Object
- SPARQL::Algebra::Operator
- Binary
- SPARQL::Algebra::Operator::Project
- Includes:
- Query
- Defined in:
- vendor/bundler/ruby/2.6.0/bundler/gems/sparql-78c2af8f957e/lib/sparql/algebra/operator/project.rb
Overview
The SPARQL GraphPattern project
operator.
Constant Summary collapse
- NAME =
[:project]
Constants inherited from Binary
Constants inherited from SPARQL::Algebra::Operator
Instance Attribute Summary
Attributes included from Query
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#execute(queryable, options = {}) {|solution| ... } ⇒ RDF::Query::Solutions
Executes this query on the given
queryable
graph or repository. -
#optimize ⇒ Union, RDF::Query
Returns an optimized version of this query.
Methods included from Query
#each_solution, #empty?, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables
Methods inherited from Binary
Methods inherited from SPARQL::Algebra::Operator
#aggregate?, arity, #base_uri, base_uri, base_uri=, #boolean, #constant?, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #initialize, #inspect, #ndvars, #node?, #operand, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, #to_sxp, #to_sxp_bin, #validate!, #variable?, #vars
Methods included from Expression
cast, #constant?, #evaluate, extension, extensions, for, #invalid?, new, #node?, open, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?
Constructor Details
This class inherits a constructor from SPARQL::Algebra::Operator::Binary
Instance Method Details
#execute(queryable, options = {}) {|solution| ... } ⇒ RDF::Query::Solutions
Executes this query on the given queryable
graph or repository.
Reduces the result set to the variables listed in the first operand
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# File 'vendor/bundler/ruby/2.6.0/bundler/gems/sparql-78c2af8f957e/lib/sparql/algebra/operator/project.rb', line 33 def execute(queryable, = {}, &block) @solutions = queryable.query(operands.last, .merge(depth: [:depth].to_i + 1)) @solutions = @solutions.project(*(operands.first)) @solutions.each(&block) if block_given? @solutions end |
#optimize ⇒ Union, RDF::Query
Returns an optimized version of this query.
Return optimized query
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# File 'vendor/bundler/ruby/2.6.0/bundler/gems/sparql-78c2af8f957e/lib/sparql/algebra/operator/project.rb', line 46 def optimize operands = operands.map(&:optimize) end |