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

Example 26 with SchemaNegotiator

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

the class TestScanLifecycleBasics method testLateSchemaTwoBatches.

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

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockLateSchemaReader(negotiator, 2);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    assertSame(ProjectionType.ALL, scan.schemaTracker().projectionType());
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    // Late schema: so no output schema is available after open
    assertFalse(scan.hasOutputSchema());
    assertTrue(reader.next());
    // Late schema, output schema available after first batch
    assertEquals(SCHEMA, scan.outputSchema());
    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();
}

Example 27 with SchemaNegotiator

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

the class TestScanLifecycleBasics method testEarlySchemaEmptyWithProject.

/**
 * Test SELECT a from an early-schema table of () (that is,
 * a schema that consists of zero columns.
 */
@Test
public void testEarlySchemaEmptyWithProject() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.projection(RowSetTestUtils.projectList("a"));
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockEmptySchemaReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    // Early schema: so output schema is available after open
    TupleMetadata expectedSchema = new SchemaBuilder().addNullable("a", MinorType.INT).build();
    assertEquals(expectedSchema, scan.outputSchema());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(expectedSchema).addSingleCol(null).addSingleCol(null).build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 28 with SchemaNegotiator

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

the class TestScanLifecycleBasics method testNullReader.

/**
 * Single reader empty schema, EOF on first next().
 * Since both no schema and no rows, we assume this to be a
 * null (not empty) result set, so no output schema.
 */
@Test
public void testNullReader() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockLateSchemaReader(negotiator, 0);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    assertFalse(reader.next());
    assertFalse(scan.hasOutputSchema());
    reader.close();
    scan.close();
}

Example 29 with SchemaNegotiator

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

the class TestScanLifecycleTwoReaders method testLateSchemaTypeConflict.

/**
 * SELECT * from two readers: both (a, b), but with a conflicting
 * type for the column b. The reader fail will with a type conflict.
 */
@Test
public void testLateSchemaTypeConflict() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.allowSchemaChange(true);
    builder.readerFactory(new TwoReaderFactory() {

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

        @Override
        public ManagedReader secondReader(SchemaNegotiator negotiator) {
            return new MockLateSchemaTypeConflictReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    verifyStandardReader(scan, 0);
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    try {
        reader.next();
        fail();
    } catch (UserException e) {
        assertTrue(e.getMessage().contains("conflict"));
    }
    reader.close();
    scan.close();
}

Example 30 with SchemaNegotiator

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

the class TestScanLifecycleTwoReaders method testModeConflict.

/**
 * SELECT * from two readers: both (a, b), but with a conflicting
 * type for the column b. The reader fail will with a type conflict.
 * We could possibly try to handle a NULLABLE --> NON NULLABLE conflict,
 * but there does not yet appear to be a compelling case for doing so.
 */
@Test
public void testModeConflict() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.allowSchemaChange(true);
    builder.readerFactory(new TwoReaderFactory() {

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

        @Override
        public ManagedReader secondReader(SchemaNegotiator negotiator) {
            return new MockModeConflictReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    verifyStandardReader(scan, 0);
    RowBatchReader reader = scan.nextReader();
    try {
        reader.open();
        fail();
    } catch (UserException e) {
        assertTrue(e.getMessage().contains("conflict"));
    }
    reader.close();
    scan.close();
}