Examples with ColumnWriter org.apache.parquet.column.ColumnWriter used on opensource projects

Example 1 with ColumnWriter

use of org.apache.parquet.column.ColumnWriter in project parquet-mr by apache.

the class TestMemColumn method testMemColumn.

@Test
public void testMemColumn() throws Exception {
    MessageType schema = MessageTypeParser.parseMessageType("message msg { required group foo { required int64 bar; } }");
    ColumnDescriptor path = schema.getColumnDescription(new String[] { "foo", "bar" });
    MemPageStore memPageStore = new MemPageStore(10);
    ColumnWriteStoreV1 memColumnsStore = newColumnWriteStoreImpl(memPageStore);
    ColumnWriter columnWriter = memColumnsStore.getColumnWriter(path);
    columnWriter.write(42l, 0, 0);
    memColumnsStore.flush();
    ColumnReader columnReader = getColumnReader(memPageStore, path, schema);
    for (int i = 0; i < columnReader.getTotalValueCount(); i++) {
        assertEquals(columnReader.getCurrentRepetitionLevel(), 0);
        assertEquals(columnReader.getCurrentDefinitionLevel(), 0);
        assertEquals(columnReader.getLong(), 42);
        columnReader.consume();
    }
}

Example 2 with ColumnWriter

use of org.apache.parquet.column.ColumnWriter in project parquet-mr by apache.

the class TestMemColumn method testMemColumnSeveralPages.

@Test
public void testMemColumnSeveralPages() throws Exception {
    MessageType mt = MessageTypeParser.parseMessageType("message msg { required group foo { required int64 bar; } }");
    String[] col = new String[] { "foo", "bar" };
    MemPageStore memPageStore = new MemPageStore(10);
    ColumnWriteStoreV1 memColumnsStore = newColumnWriteStoreImpl(memPageStore);
    ColumnDescriptor path1 = mt.getColumnDescription(col);
    ColumnDescriptor path = path1;
    ColumnWriter columnWriter = memColumnsStore.getColumnWriter(path);
    for (int i = 0; i < 2000; i++) {
        columnWriter.write(42l, 0, 0);
    }
    memColumnsStore.flush();
    ColumnReader columnReader = getColumnReader(memPageStore, path, mt);
    for (int i = 0; i < columnReader.getTotalValueCount(); i++) {
        assertEquals(columnReader.getCurrentRepetitionLevel(), 0);
        assertEquals(columnReader.getCurrentDefinitionLevel(), 0);
        assertEquals(columnReader.getLong(), 42);
        columnReader.consume();
    }
}

Example 3 with ColumnWriter

use of org.apache.parquet.column.ColumnWriter in project parquet-mr by apache.

the class TestMemColumn method testMemColumnSeveralPagesRepeated.

@Test
public void testMemColumnSeveralPagesRepeated() throws Exception {
    MessageType mt = MessageTypeParser.parseMessageType("message msg { repeated group foo { repeated int64 bar; } }");
    String[] col = new String[] { "foo", "bar" };
    MemPageStore memPageStore = new MemPageStore(10);
    ColumnWriteStoreV1 memColumnsStore = newColumnWriteStoreImpl(memPageStore);
    ColumnDescriptor path1 = mt.getColumnDescription(col);
    ColumnDescriptor path = path1;
    ColumnWriter columnWriter = memColumnsStore.getColumnWriter(path);
    int[] rs = { 0, 0, 0, 1, 1, 1, 2, 2, 2 };
    int[] ds = { 0, 1, 2, 0, 1, 2, 0, 1, 2 };
    for (int i = 0; i < 837; i++) {
        int r = rs[i % rs.length];
        int d = ds[i % ds.length];
        LOG.debug("write i: {}", i);
        if (d == 2) {
            columnWriter.write((long) i, r, d);
        } else {
            columnWriter.writeNull(r, d);
        }
    }
    memColumnsStore.flush();
    ColumnReader columnReader = getColumnReader(memPageStore, path, mt);
    int i = 0;
    for (int j = 0; j < columnReader.getTotalValueCount(); j++) {
        int r = rs[i % rs.length];
        int d = ds[i % ds.length];
        LOG.debug("read i: {}", i);
        assertEquals("r row " + i, r, columnReader.getCurrentRepetitionLevel());
        assertEquals("d row " + i, d, columnReader.getCurrentDefinitionLevel());
        if (d == 2) {
            assertEquals("data row " + i, (long) i, columnReader.getLong());
        }
        columnReader.consume();
        ++i;
    }
}

Example 4 with ColumnWriter

use of org.apache.parquet.column.ColumnWriter in project parquet-mr by apache.

the class TestMemColumn method getColumnWriter.

private ColumnWriter getColumnWriter(ColumnDescriptor path, MemPageStore memPageStore) {
    ColumnWriteStoreV1 memColumnsStore = newColumnWriteStoreImpl(memPageStore);
    ColumnWriter columnWriter = memColumnsStore.getColumnWriter(path);
    return columnWriter;
}

Example 5 with ColumnWriter

use of org.apache.parquet.column.ColumnWriter in project parquet-mr by apache.

the class TestMemColumn method testMemColumnBinary.

@Test
public void testMemColumnBinary() throws Exception {
    MessageType mt = MessageTypeParser.parseMessageType("message msg { required group foo { required binary bar; } }");
    String[] col = new String[] { "foo", "bar" };
    MemPageStore memPageStore = new MemPageStore(10);
    ColumnWriteStoreV1 memColumnsStore = newColumnWriteStoreImpl(memPageStore);
    ColumnDescriptor path1 = mt.getColumnDescription(col);
    ColumnDescriptor path = path1;
    ColumnWriter columnWriter = memColumnsStore.getColumnWriter(path);
    columnWriter.write(Binary.fromString("42"), 0, 0);
    memColumnsStore.flush();
    ColumnReader columnReader = getColumnReader(memPageStore, path, mt);
    for (int i = 0; i < columnReader.getTotalValueCount(); i++) {
        assertEquals(columnReader.getCurrentRepetitionLevel(), 0);
        assertEquals(columnReader.getCurrentDefinitionLevel(), 0);
        assertEquals(columnReader.getBinary().toStringUsingUTF8(), "42");
        columnReader.consume();
    }
}