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

Example 46 with ManagedReader

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

the class TestScanLifecycleBasics method testEarlySchemaEmpty.

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

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

Example 47 with ManagedReader

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

the class TestScanLifecycleSchema method testDefinedSchemaSubset.

/**
 * The defined schema is a subset of the reader's schema; the
 * defined schema acts as a project list.
 */
@Test
public void testDefinedSchemaSubset() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.definedSchema(SCHEMA);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockThreeColReader(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, "wilma").addRow(102, "betty").build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 48 with ManagedReader

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

the class TestScanLifecycleSchema method testLenientProvidedSchemaSubset.

/**
 * Lenient provided schema which is a subset of the reader's schema; the
 * provided schema agrees with the reader types
 */
@Test
public void testLenientProvidedSchemaSubset() {
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.providedSchema(SCHEMA);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockThreeColReader(negotiator);
        }
    });
    ScanLifecycle scan = buildScan(builder);
    assertSame(ProjectionType.ALL, scan.schemaTracker().projectionType());
    RowBatchReader reader = scan.nextReader();
    assertTrue(reader.open());
    assertEquals(MockThreeColReader.READER_SCHEMA, scan.outputSchema());
    assertTrue(reader.next());
    RowSet expected = fixture.rowSetBuilder(MockThreeColReader.READER_SCHEMA).addRow(101, "wilma", 1001).addRow(102, "betty", 1002).build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}

Example 49 with ManagedReader

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

the class TestScanLifecycleSchema method testStrictProvidedSchemaSubset.

/**
 * Lenient provided schema which is a subset of the reader's schema; the
 * provided schema agrees with the reader types
 */
@Test
public void testStrictProvidedSchemaSubset() {
    TupleMetadata schema = new SchemaBuilder().addAll(SCHEMA).build();
    schema.setBooleanProperty(TupleMetadata.IS_STRICT_SCHEMA_PROP, true);
    ScanLifecycleBuilder builder = new ScanLifecycleBuilder();
    builder.providedSchema(schema);
    builder.readerFactory(new SingleReaderFactory() {

        @Override
        public ManagedReader next(SchemaNegotiator negotiator) {
            return new MockThreeColReader(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, "wilma").addRow(102, "betty").build();
    RowSetUtilities.verify(expected, fixture.wrap(reader.output()));
    assertFalse(reader.next());
    reader.close();
    scan.close();
}