Examples with ManagedReader org.apache.drill.exec.physical.impl.scan.v3.ManagedReader used on opensource projects

Example 11 with ManagedReader

use of org.apache.drill.exec.physical.impl.scan.v3.ManagedReader in project drill by apache.

the class TestScanLifecycleSchema method testDefinedSchemaSupersset.

/**
 * The defined schema is a superset of the reader's schema; the
 * defined schema defines the missing column type.
 */
@Test
public void testDefinedSchemaSupersset() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.definedSchema(SCHEMA);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockSingleColReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    assertEquals(SCHEMA, scan.outputSchema());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(SCHEMA).addRow(101, null).addRow(102, null).build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 12 with ManagedReader

use of org.apache.drill.exec.physical.impl.scan.v3.ManagedReader in project drill by apache.

the class TestScanLifecycleSchema method testDefinedSchemaConflict.

/**
 * Reader produces a schema which conflicts with the defined schema.
 * The defined schema should be something the reader can implement; so
 * it is an error if the reader does not do so.
 */
@Test
public void testDefinedSchemaConflict() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.definedSchema(SCHEMA);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockEarlySchemaTypeConflictReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    try {
        reader.open();
        fail();
    } catch (UserException e) {
        assertTrue(e.getMessage().contains("conflict"));
    }
    reader.close();
    scan.close();
}

Example 13 with ManagedReader

use of org.apache.drill.exec.physical.impl.scan.v3.ManagedReader in project drill by apache.

the class TestScanLifecycleSchema method testDefinedSchemaSimple.

/**
 * Simplest defined schema case: the defined schema agrees
 * with the the schema the reader will produce. The defined schema
 * implies the project list, which is not visible here.
 */
@Test
public void testDefinedSchemaSimple() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.definedSchema(SCHEMA);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockEarlySchemaReader(negotiator, 1);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    // Projection defaults to SELECT *, but defined schema
    // overrides that setting.
    assertSame(ProjectionType.SOME, scan.schemaTracker().projectionType());
    verifyStandardReader(scan, 0);
    scan.close();
}

Example 14 with ManagedReader

use of org.apache.drill.exec.physical.impl.scan.v3.ManagedReader in project drill by apache.

the class TestScanLifecycleBasics method testEarlySchemaSubset.

/**
 * Test SELECT a FROM table(a, b)
 */
@Test
public void testEarlySchemaSubset() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.projection(RowSetTestUtils.projectList("a"));
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockEarlySchemaReader(negotiator, 1);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    assertSame(ProjectionType.SOME, scan.schemaTracker().projectionType());
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    // Early schema: so output schema is available after open
    TupleMetadata expectedSchema = new SchemaBuilder().add("a", MinorType.INT).build();
    assertEquals(expectedSchema, scan.outputSchema());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(expectedSchema).addRow(10).addRow(20).build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 15 with ManagedReader

use of org.apache.drill.exec.physical.impl.scan.v3.ManagedReader in project drill by apache.

the class TestScanLifecycleBasics method testEarlySchemaTwoBatches.

@Test
public void testEarlySchemaTwoBatches() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockEarlySchemaReader(negotiator, 2);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    assertSame(ProjectionType.ALL, scan.schemaTracker().projectionType());
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    assertEquals(SCHEMA, scan.outputSchema());
    assertTrue(reader.next());
    RowSetUtilities.verify(simpleExpected(0), fixture.wrap(reader.output()));
    assertTrue(reader.next());
    RowSetUtilities.verify(simpleExpected(1), fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}