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/*
* 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.rowSet.impl;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;
import java.util.Arrays;
import org.apache.drill.categories.RowSetTests;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MinorType;
import org.apache.drill.exec.physical.rowSet.ResultSetLoader;
import org.apache.drill.exec.physical.rowSet.RowSetLoader;
import org.apache.drill.exec.physical.rowSet.impl.ResultSetLoaderImpl.ResultSetOptions;
import org.apache.drill.exec.record.metadata.SchemaBuilder;
import org.apache.drill.exec.vector.ValueVector;
import org.apache.drill.test.SubOperatorTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Tests of the row limit functionality of the result set loader. The
* row limit is set up front and has a default value. Because Drill must
* discover data structure as it reads, the result set loader also allows changing
* the row limit between batches (perhaps Drill discovers that rows are much
* narrower or wider than expected.)
* <p>
* The tests here are independent of the tests for vector allocation (which does,
* in fact, depend on the row count) and vector overflow (which an occur when
* the row limit turns out to be too large.)
*/
@Category(RowSetTests.class)
public class TestResultSetLoaderLimits extends SubOperatorTest {
/**
* Verify that the writer stops when reaching the row limit.
* In this case there is no look-ahead row.
*/
@Test
public void testRowLimit() {
ResultSetLoader rsLoader = new ResultSetLoaderImpl(fixture.allocator());
assertEquals(ResultSetLoaderImpl.DEFAULT_ROW_COUNT, rsLoader.targetRowCount());
RowSetLoader rootWriter = rsLoader.writer();
rootWriter.addColumn(SchemaBuilder.columnSchema("s", MinorType.VARCHAR, DataMode.REQUIRED));
byte value[] = new byte[200];
Arrays.fill(value, (byte) 'X');
int count = 0;
rsLoader.startBatch();
while (! rootWriter.isFull()) {
rootWriter.start();
rootWriter.scalar(0).setBytes(value, value.length);
rootWriter.save();
count++;
}
assertEquals(ResultSetLoaderImpl.DEFAULT_ROW_COUNT, count);
assertEquals(count, rootWriter.rowCount());
rsLoader.harvest().clear();
// Do it again, a different way.
count = 0;
rsLoader.startBatch();
assertEquals(0, rootWriter.rowCount());
while (rootWriter.start()) {
rootWriter.scalar(0).setBytes(value, value.length);
rootWriter.save();
count++;
}
assertEquals(ResultSetLoaderImpl.DEFAULT_ROW_COUNT, count);
assertEquals(count, rootWriter.rowCount());
rsLoader.harvest().clear();
rsLoader.close();
}
private static final int TEST_ROW_LIMIT = 1024;
/**
* Verify that the caller can set a row limit lower than the default.
*/
@Test
public void testCustomRowLimit() {
// Try to set a default value larger than the hard limit. Value
// is truncated to the limit.
ResultSetOptions options = new OptionBuilder()
.setRowCountLimit(ValueVector.MAX_ROW_COUNT + 1)
.build();
assertEquals(ValueVector.MAX_ROW_COUNT, options.rowCountLimit);
// Just a bit of paranoia that we check against the vector limit,
// not any previous value...
options = new OptionBuilder()
.setRowCountLimit(ValueVector.MAX_ROW_COUNT + 1)
.setRowCountLimit(TEST_ROW_LIMIT)
.build();
assertEquals(TEST_ROW_LIMIT, options.rowCountLimit);
options = new OptionBuilder()
.setRowCountLimit(TEST_ROW_LIMIT)
.setRowCountLimit(ValueVector.MAX_ROW_COUNT + 1)
.build();
assertEquals(ValueVector.MAX_ROW_COUNT, options.rowCountLimit);
// Can't set the limit lower than 1
options = new OptionBuilder()
.setRowCountLimit(0)
.build();
assertEquals(1, options.rowCountLimit);
// Do load with a (valid) limit lower than the default.
options = new OptionBuilder()
.setRowCountLimit(TEST_ROW_LIMIT)
.build();
ResultSetLoader rsLoader = new ResultSetLoaderImpl(fixture.allocator(), options);
assertEquals(TEST_ROW_LIMIT, rsLoader.targetRowCount());
RowSetLoader rootWriter = rsLoader.writer();
rootWriter.addColumn(SchemaBuilder.columnSchema("s", MinorType.VARCHAR, DataMode.REQUIRED));
rsLoader.startBatch();
int count = fillToLimit(rootWriter);
assertEquals(TEST_ROW_LIMIT, count);
assertEquals(count, rootWriter.rowCount());
// Should fail to write beyond the row limit
assertFalse(rootWriter.start());
try {
rootWriter.save();
fail();
} catch (IllegalStateException e) {
// Expected
}
rsLoader.harvest().clear();
rsLoader.startBatch();
assertEquals(0, rootWriter.rowCount());
rsLoader.close();
}
private int fillToLimit(RowSetLoader rootWriter) {
byte value[] = new byte[200];
Arrays.fill(value, (byte) 'X');
int count = 0;
while (! rootWriter.isFull()) {
rootWriter.start();
rootWriter.scalar(0).setBytes(value, value.length);
rootWriter.save();
count++;
}
return count;
}
/**
* Test that the row limit can change between batches.
*/
@Test
public void testDynamicLimit() {
// Start with a small limit.
ResultSetOptions options = new OptionBuilder()
.setRowCountLimit(TEST_ROW_LIMIT)
.build();
ResultSetLoader rsLoader = new ResultSetLoaderImpl(fixture.allocator(), options);
assertEquals(TEST_ROW_LIMIT, rsLoader.targetRowCount());
RowSetLoader rootWriter = rsLoader.writer();
rootWriter.addColumn(SchemaBuilder.columnSchema("s", MinorType.VARCHAR, DataMode.REQUIRED));
rsLoader.startBatch();
int count = fillToLimit(rootWriter);
assertEquals(TEST_ROW_LIMIT, count);
assertEquals(count, rootWriter.rowCount());
rsLoader.harvest().clear();
// Reset the batch size larger and fill a second batch
int newLimit = 8000;
rsLoader.setTargetRowCount(newLimit);
rsLoader.startBatch();
count = fillToLimit(rootWriter);
assertEquals(newLimit, count);
assertEquals(count, rootWriter.rowCount());
rsLoader.harvest().clear();
// Put the limit back to a lower number.
newLimit = 1000;
rsLoader.setTargetRowCount(newLimit);
rsLoader.startBatch();
count = fillToLimit(rootWriter);
assertEquals(newLimit, count);
assertEquals(count, rootWriter.rowCount());
rsLoader.harvest().clear();
rsLoader.close();
}
}
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