---
name: "RDF::Query::Plan::Join"
section: "3pm"
platform: "linux"
package: "librdf-query-perl"
version: "2.919-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/RDF::Query::Plan::Join"
---

# RDF::Query::Plan::Join(3pm)

Join query plan base class.

## NAME

RDF::Query::Plan::Join - Join query plan base class.

## VERSION

This document describes RDF::Query::Plan::Join version 2.919.

## METHODS

Beyond the methods documented below, this class inherits methods from the RDF::Query::Plan class.

- "new ( $lhs, $rhs, $optional )"

  - "lhs"

  Returns the left-hand-side plan to the join.

- "rhs"

  Returns the right-hand-side plan to the join.

- "optional"

  - "bf ()"

  Returns a string representing the state of the nodes of the triple (bound or free).

- "join\_classes"

  Returns the class names of all available join algorithms.

- "distinct"

  Returns true if the pattern is guaranteed to return distinct results.

- "ordered"

  Returns true if the pattern is guaranteed to return ordered results.

- "plan\_prototype"

  Returns a list of scalar identifiers for the type of the content (children) nodes of this plan node. See RDF::Query::Plan for a list of the allowable identifiers.

- "plan\_node\_data"

  Returns the data for this plan node that corresponds to the values described by the signature returned by `"plan_prototype"`.

## AUTHOR

```
 Gregory Todd Williams <gwilliams@cpan.org>
```