mcvsubbu commented on a change in pull request #4993: Support Text column type 
in Pinot (both offline and realtime)
URL: https://github.com/apache/incubator-pinot/pull/4993#discussion_r368336179
 
 

 ##########
 File path: 
pinot-core/src/main/java/org/apache/pinot/core/realtime/impl/invertedindex/RealtimeLuceneTextIndexReader.java
 ##########
 @@ -0,0 +1,117 @@
+/**
+ * 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.pinot.core.realtime.impl.invertedindex;
+
+import java.io.File;
+import org.apache.lucene.analysis.standard.StandardAnalyzer;
+import org.apache.lucene.index.IndexWriter;
+import org.apache.lucene.queryparser.classic.QueryParser;
+import org.apache.lucene.search.Collector;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.SearcherManager;
+import org.apache.pinot.core.common.Predicate;
+import org.apache.pinot.core.common.predicate.TextMatchPredicate;
+import 
org.apache.pinot.core.segment.creator.impl.inv.text.LuceneTextIndexCreator;
+import org.apache.pinot.core.segment.index.readers.InvertedIndexReader;
+import org.apache.pinot.core.segment.index.readers.text.LuceneDocIdCollector;
+import 
org.apache.pinot.core.segment.index.readers.text.LuceneIndexSearcherReferenceManager;
+import org.apache.pinot.core.segment.index.readers.text.LuceneTextIndexReader;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+
+
+/**
+ * Lucene text index reader supporting near realtime search. An instance of 
this
+ * is created per consuming segment by {@link 
org.apache.pinot.core.indexsegment.mutable.MutableSegmentImpl}.
+ * Internally it uses {@link LuceneTextIndexCreator} for adding documents to 
the lucene index
+ * as and when they are indexed by the consuming segment.
+ */
+public class RealtimeLuceneTextIndexReader implements 
InvertedIndexReader<LuceneTextIndexReader.LuceneSearchResult> {
+  private final QueryParser _queryParser;
+  private final LuceneTextIndexCreator _indexCreator;
+  private volatile SearcherManager _searcherManager;
 
 Review comment:
   why is this volatile?

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