Reference

RDF::Query::Algebra::Aggregate(3pm)

Algebra class for aggregate patterns

NAME

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

VERSION

This document describes RDF::Query::Algebra::Aggregate version 2.919.

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 <[email protected]>

History