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>
