RDF::Query::Algebra::Aggregate - Algebra class for aggregate patterns
This document describes RDF::Query::Algebra::Aggregate version 2.918.
Beyond the methods documented below, this class inherits methods from the RDF::Query::Algebra class.
new ( $pattern, \@groupby, $alias =
new ( $pattern, \@groupby, expressions =
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.
@groupby
$alias
$op
$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.
$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 <gwilliams@cpan.org>
To install RDF::Query, copy and paste the appropriate command in to your terminal.
cpanm
cpanm RDF::Query
CPAN shell
perl -MCPAN -e shell install RDF::Query
For more information on module installation, please visit the detailed CPAN module installation guide.