| /* |
| * 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.lifecycle; |
| |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import org.apache.drill.categories.EvfTest; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.exec.physical.impl.scan.RowBatchReader; |
| import org.apache.drill.exec.physical.impl.scan.v3.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.v3.ScanLifecycleBuilder; |
| import org.apache.drill.exec.physical.impl.scan.v3.SchemaNegotiator; |
| import org.apache.drill.exec.physical.rowSet.RowSet; |
| import org.apache.drill.exec.physical.rowSet.RowSetTestUtils; |
| import org.apache.drill.test.rowSet.RowSetUtilities; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| |
| /** |
| * Test two readers in succession in various cases: empty readers, normal readers, |
| * type conflicts, etc. |
| */ |
| @Category(EvfTest.class) |
| public class TestScanLifecycleTwoReaders extends BaseTestScanLifecycle { |
| |
| /** |
| * Two null readers: neither provides a valid scan schema. |
| */ |
| @Test |
| public void testTwoNullReaders() { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| builder.readerFactory(new TwoReaderFactory() { |
| @Override |
| public ManagedReader firstReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 0); |
| } |
| |
| @Override |
| public ManagedReader secondReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 0); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyEmptyReader(scan); |
| verifyEmptyReader(scan); |
| scan.close(); |
| } |
| |
| @Test |
| public void testNullThenValidReader() { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| builder.readerFactory(new TwoReaderFactory() { |
| @Override |
| public ManagedReader firstReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 0); |
| } |
| |
| @Override |
| public ManagedReader secondReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 1); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyEmptyReader(scan); |
| verifyStandardReader(scan, 0); |
| scan.close(); |
| } |
| |
| @Test |
| public void testValidThenNullReader() { |
| 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 MockLateSchemaReader(negotiator, 0); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyStandardReader(scan, 0); |
| |
| RowBatchReader reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| assertFalse(reader.next()); |
| assertTrue(scan.hasOutputSchema()); |
| reader.close(); |
| scan.close(); |
| } |
| |
| @Test |
| public void testTwoValidReaders() { |
| 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 MockLateSchemaReader(negotiator, 1); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyStandardReader(scan, 0); |
| verifyStandardReader(scan, 0); |
| scan.close(); |
| } |
| |
| /** |
| * SELECT * FROM two readers, one with (a, b), the other with just (a). |
| * The scan will reuse the type of b from the first reader when filling |
| * the missing column in the second reader. Since the schema shrinks, |
| * the result is the same whether schema change is allowed or not. |
| */ |
| @Test |
| public void testShrinkingSchema() { |
| doTestShrinkingSchema(true); |
| doTestShrinkingSchema(false); |
| } |
| |
| private void doTestShrinkingSchema(boolean allowSchemaChange) { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| builder.allowSchemaChange(allowSchemaChange); |
| builder.readerFactory(new TwoReaderFactory() { |
| @Override |
| public ManagedReader firstReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 1); |
| } |
| |
| @Override |
| public ManagedReader secondReader(SchemaNegotiator negotiator) { |
| return new MockSingleColReader(negotiator); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyStandardReader(scan, 0); |
| |
| RowBatchReader reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| 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(); |
| } |
| |
| /** |
| * Shrinking schema, as above. Explicit projection:<pre><code> |
| * SELECT a, b FROM (a) then (a,b) |
| * </code></pre><p> |
| * But choose a missing column type (the default |
| * Nullable INT) in the first reader that will conflict with the actual column type |
| * (VARCHAR) in the second. |
| */ |
| @Test |
| public void testShrinkingSchemaWithConflict() { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| builder.projection(RowSetTestUtils.projectList("a", "b")); |
| builder.readerFactory(new TwoReaderFactory() { |
| @Override |
| public ManagedReader firstReader(SchemaNegotiator negotiator) { |
| return new MockSingleColReader(negotiator); |
| } |
| |
| @Override |
| public ManagedReader secondReader(SchemaNegotiator negotiator) { |
| return new MockEarlySchemaReader(negotiator, 1); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| RowBatchReader reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| assertTrue(reader.next()); |
| reader.output().clear(); |
| assertFalse(reader.next()); |
| reader.close(); |
| |
| reader = scan.nextReader(); |
| try { |
| reader.open(); |
| fail(); |
| } catch (UserException e) { |
| assertTrue(e.getMessage().contains("conflict")); |
| } |
| reader.close(); |
| scan.close(); |
| } |
| |
| /** |
| * SELECT * FROM two readers, one (a, b), the other (a, b, c). |
| * With schema change enabled, the third column shows up only |
| * in the second batch, forcing a schema change downstream. |
| */ |
| @Test |
| public void testExpandingSchemaAllowingSchemaChange() { |
| 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 MockThreeColReader(negotiator); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyStandardReader(scan, 0); |
| |
| RowBatchReader reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| 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(); |
| } |
| |
| /** |
| * SELECT * FROM two readers, one (a, b), the other (a, b, c). |
| * With schema change disabled, the third column is ignored in the |
| * second reader: the first reader "fixes" projection to just (a, b) |
| * even though projection started as wildcard. |
| * <p> |
| * We can argue if this behavior is correct. We know most operators, |
| * and no ODBC or JDBC client can handle schema change. So, our other |
| * options are do the schema change anyway (the above test), fail, or |
| * this choice, which is to try to muddle though. The correct solution |
| * is to provide a schema (tested elsewhere.) |
| */ |
| @Test |
| public void testExpandingSchemaDisallowingSchemaChange() { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| builder.allowSchemaChange(false); |
| builder.readerFactory(new TwoReaderFactory() { |
| @Override |
| public ManagedReader firstReader(SchemaNegotiator negotiator) { |
| return new MockLateSchemaReader(negotiator, 1); |
| } |
| |
| @Override |
| public ManagedReader secondReader(SchemaNegotiator negotiator) { |
| return new MockThreeColReader(negotiator); |
| } |
| }); |
| ScanLifecycle scan = buildScan(builder); |
| |
| verifyStandardReader(scan, 0); |
| |
| RowBatchReader reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| 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(); |
| } |
| |
| /** |
| * 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 testEarlySchemaTypeConflict() { |
| 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 MockEarlySchemaTypeConflictReader(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(); |
| } |
| |
| /** |
| * 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(); |
| } |
| |
| /** |
| * 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(); |
| } |
| |
| /** |
| * {@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(); |
| } |
| |
| /** |
| * {@code SELECT * FROM} (b,a) then (a, b). The order of the first |
| * table drives the order of the results. |
| */ |
| @Test |
| public void testColumnReorderingBA() { |
| ScanLifecycleBuilder builder = new ScanLifecycleBuilder(); |
| 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(MockReorderedReader.READER_SCHEMA) |
| .addRow("barney", 30) |
| .addRow("betty", 40) |
| .build(); |
| RowSetUtilities.verify(expected, fixture.wrap(reader.output())); |
| assertFalse(reader.next()); |
| reader.close(); |
| |
| reader = scan.nextReader(); |
| reader = scan.nextReader(); |
| assertTrue(reader.open()); |
| assertTrue(reader.next()); |
| expected = fixture.rowSetBuilder(MockReorderedReader.READER_SCHEMA) |
| .addRow("fred", 10) |
| .addRow("wilma", 20) |
| .build(); |
| RowSetUtilities.verify(expected, fixture.wrap(reader.output())); |
| assertFalse(reader.next()); |
| reader.close(); |
| scan.close(); |
| } |
| |
| /** |
| * {@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(); |
| } |
| } |