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optimize single value lookup

This commit is contained in:
Xavier Léauté 2014-05-19 23:08:16 -07:00
parent 7a351dfde3
commit 618afd9976
2 changed files with 44 additions and 83 deletions
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74
processing/src/main/java/io/druid/segment/QueryableIndexStorageAdapter.java
View File

@ -21,6 +21,7 @@ package io.druid.segment;
import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterators;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.metamx.common.guava.CloseQuietly;
@ -38,12 +39,12 @@ import io.druid.segment.column.ValueType;
import io.druid.segment.data.Indexed;
import io.druid.segment.data.IndexedInts;
import io.druid.segment.data.Offset;
import io.druid.segment.data.SingleIndexedInts;
import org.joda.time.DateTime;
import org.joda.time.Interval;
import java.io.Closeable;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
/**
@ -313,7 +314,27 @@ public class QueryableIndexStorageAdapter implements StorageAdapter
@Override
public IndexedInts getRow()
{
return new SingleIndexedInts(column.getSingleValueRow(cursorOffset.getOffset()));
// using an anonymous class is faster than creating a class that stores a copy of the value
return new IndexedInts()
{
@Override
public int size()
{
return 1;
}
@Override
public int get(int index)
{
return column.getSingleValueRow(cursorOffset.getOffset());
}
@Override
public Iterator<Integer> iterator()
{
return Iterators.singletonIterator(column.getSingleValueRow(cursorOffset.getOffset()));
}
};
}
@Override
@ -740,7 +761,27 @@ public class QueryableIndexStorageAdapter implements StorageAdapter
@Override
public IndexedInts getRow()
{
return new SingleIndexedInts(dict.getSingleValueRow(currRow));
// using an anonymous class is faster than creating a class that stores a copy of the value
return new IndexedInts()
{
@Override
public int size()
{
return 1;
}
@Override
public int get(int index)
{
return dict.getSingleValueRow(currRow);
}
@Override
public Iterator<Integer> iterator()
{
return Iterators.singletonIterator(dict.getSingleValueRow(currRow));
}
};
}
@Override
@ -979,31 +1020,4 @@ public class QueryableIndexStorageAdapter implements StorageAdapter
);
}
}
private static class NullDimensionSelector implements DimensionSelector
{
@Override
public IndexedInts getRow()
{
return new SingleIndexedInts(0);
}
@Override
public int getValueCardinality()
{
return 1;
}
@Override
public String lookupName(int id)
{
return "";
}
@Override
public int lookupId(String name)
{
return 0;
}
}
}

53
processing/src/main/java/io/druid/segment/data/SingleIndexedInts.java
View File

@ -1,53 +0,0 @@
/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.segment.data;
import com.google.common.collect.Iterators;
import java.util.Iterator;
/**
*/
public class SingleIndexedInts implements IndexedInts
{
private final int value;
public SingleIndexedInts(int value) {
this.value = value;
}
@Override
public int size()
{
return 1;
}
@Override
public int get(int index)
{
return value;
}
@Override
public Iterator<Integer> iterator()
{
return Iterators.singletonIterator(value);
}
}