Provided by: librdf-query-perl_2.908-1_all
RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns
This document describes RDF::Query::Algebra::Aggregate version 2.908.
Beyond the methods documented below, this class inherits methods from the RDF::Query::Algebra class. "new ( $pattern, \@groupby, $alias =" [$op => $col] )> "new ( $pattern, \@groupby, expressions =" [ $alias => [$op, \%options, @cols] ] )> Returns a new Aggregate structure. Groups by the named bindings in @groupby, and returns new bindings for the named $alias for the operation $op on column $col. $op may be one of: COUNT, MIN, MAX, SUM. "construct_args" Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern. "pattern" Returns the aggregates pattern. "groupby" Returns the aggregate's GROUP BY binding names. "ops" Returns a list of tuples as ARRAY refs containing "$alias, $op, @cols". "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 <firstname.lastname@example.org>