ASF GitHub Bot commented on DRILL-5797:

arina-ielchiieva commented on a change in pull request #1370: DRILL-5797: Use 
Parquet new reader in all non-complex column queries
URL: https://github.com/apache/drill/pull/1370#discussion_r201676203

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+ * 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.
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+ */
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.store.parquet.ParquetReaderUtility;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.parquet.hadoop.metadata.ParquetMetadata;
+import org.apache.parquet.hadoop.ParquetFileReader;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import java.util.List;
+import java.util.ArrayList;
+import java.io.IOException;
+ * This test checks correctness of complex column detection in the Parquet 
file schema.
+ */
+public class TestComplexColumnInSchema {
+  private static final String path = 
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> Use more often the new parquet reader
> -------------------------------------
>                 Key: DRILL-5797
>                 URL: https://issues.apache.org/jira/browse/DRILL-5797
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Storage - Parquet
>            Reporter: Damien Profeta
>            Assignee: Oleksandr Kalinin
>            Priority: Major
>             Fix For: 1.15.0
> The choice of using the regular parquet reader of the optimized one is based 
> of what type of columns is in the file. But the columns that are read by the 
> query doesn't matter. We can increase a little bit the cases where the 
> optimized reader is used by checking is the projected column are simple or 
> not.
> This is an optimization waiting for the fast parquet reader to handle complex 
> structure.

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