Examples with RowBatchReader org.apache.drill.exec.physical.impl.scan.RowBatchReader used on opensource projects

Example 41 with RowBatchReader

use of org.apache.drill.exec.physical.impl.scan.RowBatchReader in project drill by apache.

the class TestScanLifecycleTwoReaders method testSpecifiedColumnOrder.

/**
 * {@code SELECT , b FROM} (b,a) then (a, b). The order of the project list
 * drives the order of the results.
 */
@Test
public void testSpecifiedColumnOrder() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.projection(RowSetTestUtils.projectList("a", "b"));
    builder.readerFactory(new TwoReaderFactory() {

        @Override
        public ManagedReader firstReader(SchemaNegotiator negotiator) {
            return new MockReorderedReader(negotiator);
        }

        @Override
        public ManagedReader secondReader(SchemaNegotiator negotiator) {
            return new MockLateSchemaReader(negotiator, 1);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    reader = scan.nextReader();
    assertTrue(reader.open());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(SCHEMA).addRow(30, "barney").addRow(40, "betty").build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    verifyStandardReader(scan, 0);
    scan.close();
}

Example 42 with RowBatchReader

use of org.apache.drill.exec.physical.impl.scan.RowBatchReader in project drill by apache.

the class TestScanLifecycleTwoReaders method testColumnReorderingAB.

/**
 * {@code SELECT * FROM} (a, b) then (b,a). The order of the first
 * table drives the order of the results.
 */
@Test
public void testColumnReorderingAB() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.readerFactory(new TwoReaderFactory() {

        @Override
        public ManagedReader firstReader(SchemaNegotiator negotiator) {
            return new MockLateSchemaReader(negotiator, 1);
        }

        @Override
        public ManagedReader secondReader(SchemaNegotiator negotiator) {
            return new MockReorderedReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    verifyStandardReader(scan, 0);
    RowBatchReader reader = scan.nextReader();
    reader = scan.nextReader();
    assertTrue(reader.open());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(SCHEMA).addRow(30, "barney").addRow(40, "betty").build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 43 with RowBatchReader

use of org.apache.drill.exec.physical.impl.scan.RowBatchReader in project drill by apache.

the class TestReaderErrors method testCloseError.

@Test
public void testCloseError() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.errorContext(b -> b.addContext("Scan context"));
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new FailingReader(negotiator, "close");
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    assertFalse(reader.next());
    try {
        reader.close();
        fail();
    } catch (UserException e) {
    // Expected
    }
    scan.close();
}

Example 44 with RowBatchReader

use of org.apache.drill.exec.physical.impl.scan.RowBatchReader in project drill by apache.

the class TestScanLifecycleLimit method testLimitOnSecondReader.

/**
 * LIMIT 125: full first reader, limit on second
 */
@Test
public void testLimitOnSecondReader() {
    Pair<TwoReaderFactory, ScanLifecycle> pair = setupScan(125);
    TwoReaderFactory factory = pair.getLeft();
    ScanLifecycle scan = pair.getRight();
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    // First batch
    assertTrue(reader.next());
    RowSet result = fixture.wrap(reader.output());
    assertEquals(50, result.rowCount());
    result.clear();
    // Second batch
    assertTrue(reader.next());
    result = fixture.wrap(reader.output());
    assertEquals(50, result.rowCount());
    result.clear();
    // No third batch
    assertFalse(reader.next());
    reader.close();
    // Move to second reader.
    reader = scan.nextReader();
    assertNotNull(reader);
    assertTrue(reader.open());
    // First is limited
    assertTrue(reader.next());
    result = fixture.wrap(reader.output());
    assertEquals(25, result.rowCount());
    result.clear();
    // No second batch
    assertFalse(reader.next());
    reader.close();
    scan.close();
    // Both readers were created.
    assertEquals(2, factory.count());
}

Example 45 with RowBatchReader

use of org.apache.drill.exec.physical.impl.scan.RowBatchReader in project drill by apache.

the class TestScanLifecycleLimit method testLimitOnEOF.

/**
 * LIMIT 100, at EOF of the first reader.
 */
@Test
public void testLimitOnEOF() {
    Pair<TwoReaderFactory, ScanLifecycle> pair = setupScan(100);
    TwoReaderFactory factory = pair.getLeft();
    ScanLifecycle scan = pair.getRight();
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    // First batch
    assertTrue(reader.next());
    RowSet result = fixture.wrap(reader.output());
    assertEquals(50, result.rowCount());
    result.clear();
    // Second batch
    assertTrue(reader.next());
    result = fixture.wrap(reader.output());
    assertEquals(50, result.rowCount());
    result.clear();
    // No third batch
    assertFalse(reader.next());
    reader.close();
    // No next reader, despite there being two, since we hit the limit.
    assertNull(scan.nextReader());
    scan.close();
    // Only the first of the two readers were created.
    assertEquals(1, factory.count());
}