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Merge pull request #565 from metamx/add-hll-test

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test for correct HLL bytebuffer folding
This commit is contained in:
fjy 2014-05-28 12:12:34 -06:00
commit c56f3fd1af
1 changed files with 18 additions and 0 deletions
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18
processing/src/test/java/io/druid/query/aggregation/hyperloglog/HyperLogLogCollectorTest.java
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@ -305,6 +305,24 @@ public class HyperLogLogCollectorTest
}
}
@Test
public void testBufferSwap() throws Exception
{
ByteBuffer biggerOffset = makeCollectorBuffer(1, (byte) 0x00, 0x11);
ByteBuffer smallerOffset = makeCollectorBuffer(0, (byte) 0x20, 0x00);
ByteBuffer buffer = ByteBuffer.allocate(HyperLogLogCollector.getLatestNumBytesForDenseStorage());
HyperLogLogCollector collector = HyperLogLogCollector.makeCollector(buffer);
// make sure the original buffer gets modified
collector.fold(biggerOffset);
Assert.assertEquals(collector, HyperLogLogCollector.makeCollector(buffer));
// make sure the original buffer gets modified
collector.fold(smallerOffset);
Assert.assertEquals(collector, HyperLogLogCollector.makeCollector(buffer));
}
@Test
public void testFoldWithArbitraryInitialPositions() throws Exception
{