org.eclipse.rdf4j.federated.optimizer

Class OptimizerUtil

java.lang.Object

org.eclipse.rdf4j.federated.optimizer.OptimizerUtil

public class OptimizerUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
OptimizerUtil()

Method Summary

Modifier and Type	Method and Description
protected static void	collectJoinArgs(TupleExpr node, List<TupleExpr> joinArgs) Collect join arguments by descending the query tree (recursively).
static NJoin	flattenJoin(Join join, QueryInfo queryInfo) Flatten the join to one layer, i.e.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OptimizerUtil

public OptimizerUtil()

Method Detail

flattenJoin

public static NJoin flattenJoin(Join join,
                                QueryInfo queryInfo)

Flatten the join to one layer, i.e. collect all join arguments

Parameters:

join -

queryInfo -

Returns:

the flattened NJoin

collectJoinArgs

protected static void collectJoinArgs(TupleExpr node,
                                      List<TupleExpr> joinArgs)

Collect join arguments by descending the query tree (recursively).

Parameters:

node -

joinArgs -