okalinin 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_r201663246
 
 

 ##########
 File path: 
exec/java-exec/src/test/java/org/apache/drill/exec/store/parquet/TestParquetReaderUtility.java
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 @@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+import org.apache.drill.exec.store.parquet.ParquetReaderUtility;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+
+import org.apache.parquet.column.ColumnDescriptor;
+import org.apache.parquet.format.SchemaElement;
+import org.apache.parquet.hadoop.metadata.ParquetMetadata;
+import org.apache.parquet.hadoop.ParquetFileReader;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.nio.file.Paths;
+import java.util.Map;
+
+public class TestParquetReaderUtility {
+
+  private static final String path = 
"src/test/resources/store/parquet/complex/complex.parquet";
+  private static Configuration conf;
+  private static ParquetMetadata footer;
+
+  @BeforeClass
+  public static void setUpBeforeClass() throws Exception {
+    conf = new Configuration();
+
+    try {
+      footer = ParquetFileReader.readFooter(conf, new Path(path));
+    } catch (IOException ioe) {
+      fail("Could not read Parquet file '" + path + "', error message: " + 
ioe.getMessage()
+          + " cwd: " + Paths.get(".").toAbsolutePath().normalize().toString());
+      throw(ioe);
+    }
+  }
+
+  @Test
+  public void testSchemaElementsMap() {
+    assertTrue(footer != null);
+    Map<String, SchemaElement> schemaElements = 
ParquetReaderUtility.getColNameToSchemaElementMapping(footer);
+    assertTrue(schemaElements.size() == 14);
+
+    SchemaElement se = schemaElements.get("`marketing_info`.`camp_id`");
+    assertTrue(se != null);
+    assertTrue("camp_id".equals(se.getName()));
 
 Review comment:
   Done

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