NAME

       RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns

VERSION

       This document describes RDF::Query::Algebra::Aggregate version 2.910.

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>