RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns
This document describes RDF::Query::Algebra::Aggregate version 2.200, released 6 August 2009.
new ( $pattern,
\@groupby,
$alias = [$op => $col] )>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.
construct_argsReturns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.
patternReturns the aggregates pattern.
groupbyReturns the aggregates GROUP BY binding names.
opsReturns a list of tuples as ARRAY refs containing $alias,
$op,
$col.
sseReturns the SSE string for this alegbra expression.
as_sparqlReturns the SPARQL string for this alegbra expression.
typeReturns the type of this algebra expression.
referenced_variablesReturns a list of the variable names used in this algebra expression.
definite_variablesReturns a list of the variable names that will be bound after evaluating this algebra expression.
fixup ( $query,
$bridge,
$base,
\%namespaces )Returns a new pattern that is ready for execution using the given bridge. This method replaces generic node objects with bridge-native objects.
execute ( $query,
$bridge,
\%bound,
$context,
%args )Gregory Todd Williams <gwilliams@cpan.org>
