RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns
This document describes RDF::Query::Algebra::Aggregate version 2.911.
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
and returns new bindings for the named
$alias for the operation
$op on column
$op may be one of: COUNT,
Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.
Returns the aggregates pattern.
Returns the aggregate's GROUP BY binding names.
Returns a list of tuples as ARRAY refs containing
Returns the SSE string for this algebra expression.
Returns the SPARQL string for this algebra expression.
Returns the query as a nested set of plain data structures (no objects).
Returns the type of this algebra expression.
Returns a list of the variable names used in this algebra expression.
Returns a list of the variable names used in this algebra expression that will bind values during execution.
Returns a list of the variable names that will be bound after evaluating this algebra expression.
Gregory Todd Williams <email@example.com>