| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.drill.exec.physical.impl.scan.v3; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import org.apache.drill.categories.EvfTest; |
| import org.apache.drill.exec.physical.impl.scan.ScanOperatorExec; |
| import org.apache.drill.exec.physical.rowSet.RowSet.SingleRowSet; |
| import org.apache.drill.exec.physical.rowSet.RowSetBuilder; |
| import org.apache.drill.test.rowSet.RowSetComparison; |
| import org.apache.drill.test.rowSet.RowSetUtilities; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| |
| /** |
| * Test "early schema" readers: those that can declare a schema at |
| * open time. |
| */ |
| @Category(EvfTest.class) |
| public class TestScanEarlySchema extends BaseScanTest { |
| |
| @Test |
| public void testEarlySchemaLifecycle() { |
| |
| // Create a mock reader, return two batches: one schema-only, another with data. |
| ObservableCreator creator = new ObservableCreator() { |
| @Override |
| public ManagedReader create(SchemaNegotiator negotiator) { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader(negotiator); |
| reader.batchLimit = 1; |
| return reader; |
| } |
| }; |
| |
| ScanFixture scanFixture = simpleFixture(creator); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| |
| SingleRowSet expected = makeExpected(); |
| RowSetComparison verifier = new RowSetComparison(expected); |
| |
| // First batch: return schema. |
| assertTrue(scan.buildSchema()); |
| MockEarlySchemaReader reader = creator.reader(); |
| assertEquals(0, reader.batchCount); |
| assertEquals(expected.batchSchema(), scan.batchAccessor().schema()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| // Next call, return with data. |
| assertTrue(scan.next()); |
| verifier.verifyAndClearAll(fixture.wrap(scan.batchAccessor().container())); |
| |
| // EOF |
| assertFalse(scan.next()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| // Next again: no-op |
| assertFalse(scan.next()); |
| scanFixture.close(); |
| |
| // Close again: no-op |
| scan.close(); |
| } |
| |
| @Test |
| public void testEarlySchemaLifecycleNoSchemaBatch() { |
| |
| // Create a mock reader, return one batch with data. |
| ReaderCreator creator = negotiator -> { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader(negotiator); |
| reader.batchLimit = 1; |
| return reader; |
| }; |
| |
| // Create the scan operator |
| BaseScanFixtureBuilder builder = simpleBuilder(creator); |
| builder.enableSchemaBatch = false; |
| ScanFixture scanFixture = builder.build(); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| |
| SingleRowSet expected = makeExpected(); |
| RowSetComparison verifier = new RowSetComparison(expected); |
| |
| // First batch: return with data. |
| assertTrue(scan.next()); |
| verifier.verifyAndClearAll(fixture.wrap(scan.batchAccessor().container())); |
| |
| // EOF |
| assertFalse(scan.next()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| // Next again: no-op |
| assertFalse(scan.next()); |
| scanFixture.close(); |
| |
| // Close again: no-op |
| scan.close(); |
| } |
| |
| private static class MockEarlySchemaReader3 extends MockEarlySchemaReader { |
| |
| public MockEarlySchemaReader3(SchemaNegotiator schemaNegotiator) { |
| super(schemaNegotiator); |
| } |
| |
| @Override |
| public boolean next() { |
| if (batchCount >= batchLimit) { |
| return false; |
| } |
| batchCount++; |
| |
| makeBatch(); |
| return batchCount < batchLimit; |
| } |
| } |
| |
| @Test |
| public void testEarlySchemaDataWithEof() { |
| |
| // Create a mock reader, return two batches: one schema-only, another with data. |
| ReaderCreator creator = negotiator -> { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader3(negotiator); |
| reader.batchLimit = 1; |
| return reader; |
| }; |
| |
| // Create the scan operator |
| ScanFixture scanFixture = simpleFixture(creator); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| |
| SingleRowSet expected = makeExpected(); |
| RowSetComparison verifier = new RowSetComparison(expected); |
| |
| // First batch: return schema. |
| assertTrue(scan.buildSchema()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| // Next call, return with data. |
| assertTrue(scan.next()); |
| verifier.verifyAndClearAll(fixture.wrap(scan.batchAccessor().container())); |
| |
| // EOF |
| assertFalse(scan.next()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| // Next again: no-op |
| assertFalse(scan.next()); |
| scanFixture.close(); |
| |
| // Close again: no-op |
| scan.close(); |
| } |
| |
| /** |
| * Test EOF on the first batch. Is allowed, but will result in the scan operator |
| * passing a null batch to the parent. |
| */ |
| @Test |
| public void testEOFOnSchema() { |
| |
| // Create a mock reader, return two batches: one schema-only, another with data. |
| ReaderCreator creator = negotiator -> |
| new EofOnOpenReader(negotiator); |
| |
| ScanFixture scanFixture = simpleFixture(creator); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| |
| // EOF |
| assertFalse(scan.buildSchema()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| scanFixture.close(); |
| } |
| |
| @Test |
| public void testEOFOnFirstBatch() { |
| ReaderCreator creator = negotiator -> { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader(negotiator); |
| reader.batchLimit = 0; |
| return reader; |
| }; |
| |
| ScanFixture scanFixture = simpleFixture(creator); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| assertTrue(scan.buildSchema()); |
| |
| // EOF. Returns a single empty batch with early schema |
| // in order to provide an empty result set. |
| |
| assertTrue(scan.next()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| |
| RowSetUtilities.verify( |
| RowSetBuilder.emptyBatch(fixture.allocator(), expectedSchema()), |
| fixture.wrap(scan.batchAccessor().container())); |
| |
| assertFalse(scan.next()); |
| scanFixture.close(); |
| } |
| |
| /** |
| * Test normal case with multiple readers. These return |
| * the same schema, so no schema change. |
| */ |
| |
| @Test |
| public void testMultipleReaders() { |
| ReaderCreator creator1 = negotiator -> |
| new EofOnOpenReader(negotiator); |
| |
| ReaderCreator creator2 = negotiator -> { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader(negotiator); |
| reader.batchLimit = 2; |
| return reader; |
| }; |
| ReaderCreator creator3 = negotiator -> { |
| MockEarlySchemaReader reader = new MockEarlySchemaReader(negotiator); |
| reader.batchLimit = 2; |
| reader.startIndex = 100; |
| return reader; |
| }; |
| |
| ScanFixture scanFixture = simpleFixture(creator1, creator2, creator3); |
| ScanOperatorExec scan = scanFixture.scanOp; |
| |
| // First batch, schema only. |
| assertTrue(scan.buildSchema()); |
| assertEquals(1, scan.batchAccessor().schemaVersion()); |
| scan.batchAccessor().release(); |
| |
| // Second batch. |
| assertTrue(scan.next()); |
| assertEquals(1, scan.batchAccessor().schemaVersion()); |
| verifyBatch(0, scan.batchAccessor().container()); |
| |
| // Third batch. |
| assertTrue(scan.next()); |
| assertEquals(1, scan.batchAccessor().schemaVersion()); |
| verifyBatch(20, scan.batchAccessor().container()); |
| |
| // Second reader. First batch includes data, no special first-batch |
| // handling for the second reader. |
| assertTrue(scan.next()); |
| assertEquals(1, scan.batchAccessor().schemaVersion()); |
| verifyBatch(100, scan.batchAccessor().container()); |
| |
| // Second batch from second reader. |
| assertTrue(scan.next()); |
| assertEquals(1, scan.batchAccessor().schemaVersion()); |
| verifyBatch(120, scan.batchAccessor().container()); |
| |
| // EOF |
| assertFalse(scan.next()); |
| assertEquals(0, scan.batchAccessor().rowCount()); |
| scanFixture.close(); |
| } |
| } |