TestColumnReaderImpl.java

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 * 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 parquet.column.impl;

import static junit.framework.Assert.assertEquals;
import static parquet.column.ParquetProperties.WriterVersion.PARQUET_2_0;

import java.util.List;

import org.junit.Test;

import parquet.column.ColumnDescriptor;
import parquet.column.ColumnReader;
import parquet.column.ParquetProperties;
import parquet.column.page.DataPage;
import parquet.column.page.DataPageV2;
import parquet.column.page.mem.MemPageReader;
import parquet.column.page.mem.MemPageWriter;
import parquet.io.api.Binary;
import parquet.io.api.PrimitiveConverter;
import parquet.schema.MessageType;
import parquet.schema.MessageTypeParser;

public class TestColumnReaderImpl {

  private int rows = 13001;

  private static final class ValidatingConverter extends PrimitiveConverter {
    int count;

    @Override
    public void addBinary(Binary value) {
      assertEquals("bar" + count % 10, value.toStringUsingUTF8());
      ++ count;
    }
  }

  @Test
  public void test() {
    MessageType schema = MessageTypeParser.parseMessageType("message test { required binary foo; }");
    ColumnDescriptor col = schema.getColumns().get(0);
    MemPageWriter pageWriter = new MemPageWriter();
    ColumnWriterV2 columnWriterV2 = new ColumnWriterV2(col, pageWriter, 1024, new ParquetProperties(1024, PARQUET_2_0, true));
    for (int i = 0; i < rows; i++) {
      columnWriterV2.write(Binary.fromString("bar" + i % 10), 0, 0);
      if ((i + 1) % 1000 == 0) {
        columnWriterV2.writePage(i);
      }
    }
    columnWriterV2.writePage(rows);
    columnWriterV2.finalizeColumnChunk();
    List<DataPage> pages = pageWriter.getPages();
    int valueCount = 0;
    int rowCount = 0;
    for (DataPage dataPage : pages) {
      valueCount += dataPage.getValueCount();
      rowCount += ((DataPageV2)dataPage).getRowCount();
    }
    assertEquals(rows, rowCount);
    assertEquals(rows, valueCount);
    MemPageReader pageReader = new MemPageReader((long)rows, pages.iterator(), pageWriter.getDictionaryPage());
    ValidatingConverter converter = new ValidatingConverter();
    ColumnReader columnReader = new ColumnReaderImpl(col, pageReader, converter);
    for (int i = 0; i < rows; i++) {
      assertEquals(0, columnReader.getCurrentRepetitionLevel());
      assertEquals(0, columnReader.getCurrentDefinitionLevel());
      columnReader.writeCurrentValueToConverter();
      columnReader.consume();
    }
    assertEquals(rows, converter.count);
  }

  @Test
  public void testOptional() {
    MessageType schema = MessageTypeParser.parseMessageType("message test { optional binary foo; }");
    ColumnDescriptor col = schema.getColumns().get(0);
    MemPageWriter pageWriter = new MemPageWriter();
    ColumnWriterV2 columnWriterV2 = new ColumnWriterV2(col, pageWriter, 1024, new ParquetProperties(1024, PARQUET_2_0, true));
    for (int i = 0; i < rows; i++) {
      columnWriterV2.writeNull(0, 0);
      if ((i + 1) % 1000 == 0) {
        columnWriterV2.writePage(i);
      }
    }
    columnWriterV2.writePage(rows);
    columnWriterV2.finalizeColumnChunk();
    List<DataPage> pages = pageWriter.getPages();
    int valueCount = 0;
    int rowCount = 0;
    for (DataPage dataPage : pages) {
      valueCount += dataPage.getValueCount();
      rowCount += ((DataPageV2)dataPage).getRowCount();
    }
    assertEquals(rows, rowCount);
    assertEquals(rows, valueCount);
    MemPageReader pageReader = new MemPageReader((long)rows, pages.iterator(), pageWriter.getDictionaryPage());
    ValidatingConverter converter = new ValidatingConverter();
    ColumnReader columnReader = new ColumnReaderImpl(col, pageReader, converter);
    for (int i = 0; i < rows; i++) {
      assertEquals(0, columnReader.getCurrentRepetitionLevel());
      assertEquals(0, columnReader.getCurrentDefinitionLevel());
      columnReader.consume();
    }
    assertEquals(0, converter.count);
  }

}