parquet-hadoop/src/test/java/org/apache/parquet/hadoop/example/GroupReadSupportTest.java

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 * 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
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package org.apache.parquet.hadoop.example;

import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.parquet.hadoop.api.InitContext;
import org.junit.Test;
import org.apache.parquet.hadoop.api.ReadSupport;
import org.apache.parquet.schema.MessageType;
import org.apache.parquet.schema.MessageTypeParser;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.assertEquals;

public class GroupReadSupportTest {

  private String fullSchemaStr = "message example {\n" +
          "required int32 line;\n" +
          "optional binary content;\n" +
          "}";

  private String partialSchemaStr = "message example {\n" +
          "required int32 line;\n" +
          "}";


  @Test
  public void testInitWithoutSpecifyingRequestSchema() throws Exception {
    GroupReadSupport s = new GroupReadSupport();
    Configuration configuration = new Configuration();
    Map<String, Set<String>> keyValueMetaData = new HashMap<>();
    MessageType fileSchema = MessageTypeParser.parseMessageType(fullSchemaStr);

    ReadSupport.ReadContext context = s.init(new InitContext(configuration, keyValueMetaData, fileSchema));
    assertEquals(context.getRequestedSchema(), fileSchema);
  }

  @Test
  public void testInitWithPartialSchema() {
    GroupReadSupport s = new GroupReadSupport();
    Configuration configuration = new Configuration();
    Map<String, Set<String>> keyValueMetaData = new HashMap<>();
    MessageType fileSchema = MessageTypeParser.parseMessageType(fullSchemaStr);
    MessageType partialSchema = MessageTypeParser.parseMessageType(partialSchemaStr);
    configuration.set(ReadSupport.PARQUET_READ_SCHEMA, partialSchemaStr);

    ReadSupport.ReadContext context = s.init(new InitContext(configuration, keyValueMetaData, fileSchema));
    assertEquals(context.getRequestedSchema(), partialSchema);
  }
}