RDF::Query::Algebra::Union - Algebra class for Union patterns
This document describes RDF::Query::Algebra::Union version 2.918.
Beyond the methods documented below, this class inherits methods from the RDF::Query::Algebra class.
new ( $left,
$right )
Returns a new Union structure.
construct_args
Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.
first
Returns the first pattern (LHS) of the union.
second
Returns the second pattern (RHS) of the union.
patterns
Returns the two patterns belonging to the UNION pattern.
sse
Returns the SSE string for this algebra expression.
as_sparql
Returns the SPARQL string for this algebra expression.
as_hash
Returns the query as a nested set of plain data structures (no objects).
type
Returns the type of this algebra expression.
referenced_variables
Returns a list of the variable names used in this algebra expression.
potentially_bound
Returns a list of the variable names used in this algebra expression that will bind values during execution.
definite_variables
Returns a list of the variable names that will be bound after evaluating this algebra expression.
Gregory Todd Williams <gwilliams@cpan.org>