Github user isper3at commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/172#discussion_r139547647
--- Diff:
extras/indexing/src/main/java/org/apache/rya/indexing/mongodb/pcj/PcjQueryNode.java
---
@@ -0,0 +1,184 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.rya.indexing.mongodb.pcj;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+
+import org.apache.accumulo.core.client.AccumuloException;
+import org.apache.accumulo.core.client.AccumuloSecurityException;
+import org.apache.accumulo.core.client.TableNotFoundException;
+import org.apache.accumulo.core.security.Authorizations;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.rya.api.utils.IteratorWrapper;
+import org.apache.rya.indexing.external.tupleSet.ExternalTupleSet;
+import org.apache.rya.indexing.external.tupleSet.ParsedQueryUtil;
+import org.apache.rya.indexing.pcj.matching.PCJOptimizerUtilities;
+import org.apache.rya.indexing.pcj.storage.PcjException;
+import
org.apache.rya.indexing.pcj.storage.PrecomputedJoinStorage.CloseableIterator;
+import
org.apache.rya.indexing.pcj.storage.PrecomputedJoinStorage.PCJStorageException;
+import org.apache.rya.indexing.pcj.storage.mongo.MongoPcjDocuments;
+import org.apache.rya.rdftriplestore.evaluation.ExternalBatchingIterator;
+import org.openrdf.query.BindingSet;
+import org.openrdf.query.MalformedQueryException;
+import org.openrdf.query.QueryEvaluationException;
+import org.openrdf.query.algebra.Projection;
+import org.openrdf.query.algebra.TupleExpr;
+import org.openrdf.query.parser.ParsedTupleQuery;
+import org.openrdf.query.parser.sparql.SPARQLParser;
+import org.openrdf.sail.SailException;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+
+import edu.umd.cs.findbugs.annotations.DefaultAnnotation;
+import edu.umd.cs.findbugs.annotations.NonNull;
+import info.aduna.iteration.CloseableIteration;
+
+/**
+ * Indexing Node for PCJs expressions to be inserted into execution plan to
+ * delegate entity portion of query to {@link MongoPrecomputedJoinIndexer}.
+ */
+@DefaultAnnotation(NonNull.class)
+public class PcjQueryNode extends ExternalTupleSet implements
ExternalBatchingIterator {
+ private final String tablename;
+ private final PcjIndexer indexer;
+ private final MongoPcjDocuments pcjDocs;
+
+ /**
+ *
+ * @param sparql - name of sparql query whose results will be stored
in PCJ table
+ * @param conf - Rya Configuration
+ * @param tablename - name of an existing PCJ table
+ * @throws MalformedQueryException
+ * @throws SailException
+ * @throws QueryEvaluationException
+ * @throws TableNotFoundException
+ * @throws AccumuloSecurityException
+ * @throws AccumuloException
+ * @throws PCJStorageException
+ */
+ public PcjQueryNode(final String sparql, final String tablename, final
MongoPcjDocuments pcjDocs)
+ throws MalformedQueryException, SailException,
QueryEvaluationException, TableNotFoundException,
+ AccumuloException, AccumuloSecurityException,
PCJStorageException {
+ this.pcjDocs = checkNotNull(pcjDocs);
+ indexer = new MongoPrecomputedJoinIndexer();
--- End diff --
the indexer keeps the connection state for mongo. If we want to break that
out...I guess we can. It goes against how we've done all the other indexers.
---
