Examples with MemPageReader org.apache.parquet.column.page.mem.MemPageReader used on opensource projects

Example 1 with MemPageReader

use of org.apache.parquet.column.page.mem.MemPageReader in project parquet-mr by apache.

the class TestColumnReaderImpl method testOptional.

@Test
public void testOptional() throws Exception {
    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, ParquetProperties.builder().withDictionaryPageSize(1024).withWriterVersion(PARQUET_2_0).withPageSize(2048).build());
    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, VersionParser.parse(Version.FULL_VERSION));
    for (int i = 0; i < rows; i++) {
        assertEquals(0, columnReader.getCurrentRepetitionLevel());
        assertEquals(0, columnReader.getCurrentDefinitionLevel());
        columnReader.consume();
    }
    assertEquals(0, converter.count);
}

Example 2 with MemPageReader

use of org.apache.parquet.column.page.mem.MemPageReader in project parquet-mr by apache.

the class TestColumnReaderImpl method test.

@Test
public void test() throws Exception {
    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, ParquetProperties.builder().withDictionaryPageSize(1024).withWriterVersion(PARQUET_2_0).withPageSize(2048).build());
    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, VersionParser.parse(Version.FULL_VERSION));
    for (int i = 0; i < rows; i++) {
        assertEquals(0, columnReader.getCurrentRepetitionLevel());
        assertEquals(0, columnReader.getCurrentDefinitionLevel());
        columnReader.writeCurrentValueToConverter();
        columnReader.consume();
    }
    assertEquals(rows, converter.count);
}