RDF::Query::Algebra::Aggregate(3pm) User Contributed Perl Documentation RDF::Query::Algebra::Aggregate(3pm)
NAME
RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns
VERSION
This document describes RDF::Query::Algebra::Aggregate version 2.908.
METHODS
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.
AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
perl v5.14.2 2012-01-31 RDF::Query::Algebra::Aggregate(3pm)