Deprecate Aggregator.getName and AggregatorFactory.getAggregatorStartValue. (#3572)

extensions-contrib/distinctcount/src/main/java/io/druid/query/aggregation/distinctcount/DistinctCountAggregator.java

@@ -26,17 +26,14 @@ import io.druid.segment.DimensionSelector;
 public class DistinctCountAggregator implements Aggregator
 {
 
-  private final String name;
   private final DimensionSelector selector;
   private final MutableBitmap mutableBitmap;
 
   public DistinctCountAggregator(
-      String name,
       DimensionSelector selector,
       MutableBitmap mutableBitmap
   )
   {
-    this.name = name;
     this.selector = selector;
     this.mutableBitmap = mutableBitmap;
   }
@@ -70,7 +67,7 @@ public class DistinctCountAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-contrib/distinctcount/src/main/java/io/druid/query/aggregation/distinctcount/DistinctCountAggregatorFactory.java

@@ -69,10 +69,9 @@ public class DistinctCountAggregatorFactory extends AggregatorFactory
   {
     DimensionSelector selector = makeDimensionSelector(columnFactory);
     if (selector == null) {
-      return new EmptyDistinctCountAggregator(name);
+      return new EmptyDistinctCountAggregator();
     } else {
       return new DistinctCountAggregator(
-          name,
           selector,
           bitMapFactory.makeEmptyMutableBitmap()
       );
@@ -197,12 +196,6 @@ public class DistinctCountAggregatorFactory extends AggregatorFactory
     return Longs.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return 0;
-  }
-
   @Override
   public boolean equals(Object o)
   {

extensions-contrib/distinctcount/src/main/java/io/druid/query/aggregation/distinctcount/EmptyDistinctCountAggregator.java

@@ -24,11 +24,8 @@ import io.druid.query.aggregation.Aggregator;
 public class EmptyDistinctCountAggregator implements Aggregator
 {
 
-  private final String name;
+  public EmptyDistinctCountAggregator()
-
-  public EmptyDistinctCountAggregator(String name)
   {
-    this.name = name;
   }
 
   @Override
@@ -56,7 +53,7 @@ public class EmptyDistinctCountAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/EmptySketchAggregator.java

@@ -23,11 +23,8 @@ import io.druid.query.aggregation.Aggregator;
 
 public class EmptySketchAggregator implements Aggregator
 {
-  private final String name;
+  public EmptySketchAggregator()
-
-  public EmptySketchAggregator(String name)
   {
-    this.name = name;
   }
 
   @Override
@@ -61,7 +58,7 @@ public class EmptySketchAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchAggregator.java

@@ -37,16 +37,12 @@ public class SketchAggregator implements Aggregator
   private static final Logger logger = new Logger(SketchAggregator.class);
 
   private final ObjectColumnSelector selector;
-  private final String name;
-  private final int size;
 
   private Union union;
 
-  public SketchAggregator(String name, ObjectColumnSelector selector, int size)
+  public SketchAggregator(ObjectColumnSelector selector, int size)
   {
-    this.name = name;
     this.selector = selector;
-    this.size = size;
     union = new SynchronizedUnion((Union) SetOperation.builder().build(size, Family.UNION));
   }
 
@@ -93,7 +89,7 @@ public class SketchAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchAggregatorFactory.java

@@ -29,7 +29,6 @@ import com.yahoo.sketches.Util;
 import com.yahoo.sketches.memory.Memory;
 import com.yahoo.sketches.theta.SetOperation;
 import com.yahoo.sketches.theta.Sketch;
-import com.yahoo.sketches.theta.Sketches;
 import com.yahoo.sketches.theta.Union;
 import io.druid.java.util.common.IAE;
 import io.druid.query.aggregation.Aggregator;
@@ -82,9 +81,9 @@ public abstract class SketchAggregatorFactory extends AggregatorFactory
   {
     ObjectColumnSelector selector = metricFactory.makeObjectColumnSelector(fieldName);
     if (selector == null) {
-      return new EmptySketchAggregator(name);
+      return new EmptySketchAggregator();
     } else {
-      return new SketchAggregator(name, selector, size);
+      return new SketchAggregator(selector, size);
     }
   }
 
@@ -172,12 +171,6 @@ public abstract class SketchAggregatorFactory extends AggregatorFactory
     return SetOperation.getMaxUnionBytes(size);
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return Sketches.updateSketchBuilder().build(size);
-  }
-
   @Override
   public List<String> requiredFields()
   {

extensions-core/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramAggregator.java

@@ -41,7 +41,6 @@ public class ApproximateHistogramAggregator implements Aggregator
     return ((ApproximateHistogram) lhs).foldFast((ApproximateHistogram) rhs);
   }
 
-  private final String name;
   private final FloatColumnSelector selector;
   private final int resolution;
   private final float lowerLimit;
@@ -50,14 +49,12 @@ public class ApproximateHistogramAggregator implements Aggregator
   private ApproximateHistogram histogram;
 
   public ApproximateHistogramAggregator(
-      String name,
       FloatColumnSelector selector,
       int resolution,
       float lowerLimit,
       float upperLimit
   )
   {
-    this.name = name;
     this.selector = selector;
     this.resolution = resolution;
     this.lowerLimit = lowerLimit;
@@ -98,7 +95,7 @@ public class ApproximateHistogramAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-core/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramAggregatorFactory.java

@@ -81,7 +81,6 @@ public class ApproximateHistogramAggregatorFactory extends AggregatorFactory
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
     return new ApproximateHistogramAggregator(
-        name,
         metricFactory.makeFloatColumnSelector(fieldName),
         resolution,
         lowerLimit,
@@ -254,12 +253,6 @@ public class ApproximateHistogramAggregatorFactory extends AggregatorFactory
     return new ApproximateHistogram(resolution).getMaxStorageSize();
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return new ApproximateHistogram(resolution);
-  }
-
   @Override
   public boolean equals(Object o)
   {

extensions-core/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingAggregator.java

@@ -25,7 +25,6 @@ import io.druid.segment.ObjectColumnSelector;
 
 public class ApproximateHistogramFoldingAggregator implements Aggregator
 {
-  private final String name;
   private final ObjectColumnSelector<ApproximateHistogram> selector;
   private final int resolution;
   private final float lowerLimit;
@@ -36,14 +35,12 @@ public class ApproximateHistogramFoldingAggregator implements Aggregator
   private long[] tmpBufferB;
 
   public ApproximateHistogramFoldingAggregator(
-      String name,
       ObjectColumnSelector<ApproximateHistogram> selector,
       int resolution,
       float lowerLimit,
       float upperLimit
   )
   {
-    this.name = name;
     this.selector = selector;
     this.resolution = resolution;
     this.lowerLimit = lowerLimit;
@@ -96,7 +93,7 @@ public class ApproximateHistogramFoldingAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

extensions-core/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingAggregatorFactory.java

@@ -80,7 +80,6 @@ public class ApproximateHistogramFoldingAggregatorFactory extends ApproximateHis
     final Class cls = selector.classOfObject();
     if (cls.equals(Object.class) || ApproximateHistogram.class.isAssignableFrom(cls)) {
       return new ApproximateHistogramFoldingAggregator(
-          name,
           selector,
           resolution,
           lowerLimit,

extensions-core/histogram/src/test/java/io/druid/query/aggregation/histogram/ApproximateHistogramPostAggregatorTest.java

@@ -45,14 +45,14 @@ public class ApproximateHistogramPostAggregatorTest
     ApproximateHistogram ah = buildHistogram(10, VALUES);
     final TestFloatColumnSelector selector = new TestFloatColumnSelector(VALUES);
 
-    ApproximateHistogramAggregator agg = new ApproximateHistogramAggregator("price", selector, 10, Float.NEGATIVE_INFINITY, Float.POSITIVE_INFINITY);
+    ApproximateHistogramAggregator agg = new ApproximateHistogramAggregator(selector, 10, Float.NEGATIVE_INFINITY, Float.POSITIVE_INFINITY);
     for (int i = 0; i < VALUES.length; i++) {
       agg.aggregate();
       selector.increment();
     }
 
     Map<String, Object> metricValues = new HashMap<String, Object>();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put("price", agg.get());
 
     ApproximateHistogramPostAggregator approximateHistogramPostAggregator = new EqualBucketsPostAggregator(
         "approxHist",

extensions-core/stats/src/main/java/io/druid/query/aggregation/variance/VarianceAggregator.java

@@ -28,13 +28,10 @@ import io.druid.segment.ObjectColumnSelector;
  */
 public abstract class VarianceAggregator implements Aggregator
 {
-  protected final String name;
-
   protected final VarianceAggregatorCollector holder = new VarianceAggregatorCollector();
 
-  public VarianceAggregator(String name)
+  public VarianceAggregator()
   {
-    this.name = name;
   }
 
   @Override
@@ -52,7 +49,7 @@ public abstract class VarianceAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
@@ -76,9 +73,9 @@ public abstract class VarianceAggregator implements Aggregator
   {
     private final FloatColumnSelector selector;
 
-    public FloatVarianceAggregator(String name, FloatColumnSelector selector)
+    public FloatVarianceAggregator(FloatColumnSelector selector)
     {
-      super(name);
+      super();
       this.selector = selector;
     }
 
@@ -93,9 +90,9 @@ public abstract class VarianceAggregator implements Aggregator
   {
     private final LongColumnSelector selector;
 
-    public LongVarianceAggregator(String name, LongColumnSelector selector)
+    public LongVarianceAggregator(LongColumnSelector selector)
     {
-      super(name);
+      super();
       this.selector = selector;
     }
 
@@ -110,9 +107,9 @@ public abstract class VarianceAggregator implements Aggregator
   {
     private final ObjectColumnSelector selector;
 
-    public ObjectVarianceAggregator(String name, ObjectColumnSelector selector)
+    public ObjectVarianceAggregator(ObjectColumnSelector selector)
     {
-      super(name);
+      super();
       this.selector = selector;
     }
 

extensions-core/stats/src/main/java/io/druid/query/aggregation/variance/VarianceAggregatorFactory.java

@@ -99,17 +99,11 @@ public class VarianceAggregatorFactory extends AggregatorFactory
     }
 
     if ("float".equalsIgnoreCase(inputType)) {
-      return new VarianceAggregator.FloatVarianceAggregator(
+      return new VarianceAggregator.FloatVarianceAggregator(metricFactory.makeFloatColumnSelector(fieldName));
-          name,
-          metricFactory.makeFloatColumnSelector(fieldName)
-      );
     } else if ("long".equalsIgnoreCase(inputType)) {
-      return new VarianceAggregator.LongVarianceAggregator(
+      return new VarianceAggregator.LongVarianceAggregator(metricFactory.makeLongColumnSelector(fieldName));
-          name,
-          metricFactory.makeLongColumnSelector(fieldName)
-      );
     } else if ("variance".equalsIgnoreCase(inputType)) {
-      return new VarianceAggregator.ObjectVarianceAggregator(name, selector);
+      return new VarianceAggregator.ObjectVarianceAggregator(selector);
     }
     throw new IAE(
         "Incompatible type for metric[%s], expected a float, long or variance, got a %s", fieldName, inputType
@@ -169,12 +163,6 @@ public class VarianceAggregatorFactory extends AggregatorFactory
     return VarianceAggregatorCollector.COMPARATOR;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return new VarianceAggregatorCollector();
-  }
-
   @Override
   public Object combine(Object lhs, Object rhs)
   {

extensions-core/stats/src/test/java/io/druid/query/aggregation/variance/VarianceAggregatorTest.java

@@ -76,8 +76,6 @@ public class VarianceAggregatorTest
   {
     VarianceAggregator agg = (VarianceAggregator) aggFactory.factorize(colSelectorFactory);
 
-    Assert.assertEquals("billy", agg.getName());
-
     assertValues((VarianceAggregatorCollector) agg.get(), 0, 0d, 0d);
     aggregate(selector, agg);
     assertValues((VarianceAggregatorCollector) agg.get(), 1, 1.1d, 0d);

indexing-hadoop/src/main/java/io/druid/indexer/InputRowSerde.java

@@ -99,9 +99,9 @@ public class InputRowSerde
         catch (ParseException e) {
           // "aggregate" can throw ParseExceptions if a selector expects something but gets something else.
           if (reportParseExceptions) {
-            throw new ParseException(e, "Encountered parse error for aggregator[%s]", agg.getName());
+            throw new ParseException(e, "Encountered parse error for aggregator[%s]", k);
           }
-          log.debug(e, "Encountered parse error, skipping aggregator[%s].", agg.getName());
+          log.debug(e, "Encountered parse error, skipping aggregator[%s].", k);
         }
 
         String t = aggFactory.getTypeName();

processing/src/main/java/io/druid/query/QueryRunnerHelper.java

@@ -44,17 +44,6 @@ public class QueryRunnerHelper
 {
   private static final Logger log = new Logger(QueryRunnerHelper.class);
 
-  public static Aggregator[] makeAggregators(Cursor cursor, List<AggregatorFactory> aggregatorSpecs)
-  {
-    Aggregator[] aggregators = new Aggregator[aggregatorSpecs.size()];
-    int aggregatorIndex = 0;
-    for (AggregatorFactory spec : aggregatorSpecs) {
-      aggregators[aggregatorIndex] = spec.factorize(cursor);
-      ++aggregatorIndex;
-    }
-    return aggregators;
-  }
-
   public static <T> Sequence<Result<T>> makeCursorBasedQuery(
       final StorageAdapter adapter,
       List<Interval> queryIntervals,

processing/src/main/java/io/druid/query/aggregation/Aggregator.java

@@ -37,7 +37,11 @@ public interface Aggregator {
   void reset();
   Object get();
   float getFloat();
-  String getName();
+
+  /**
+   * Deprecated, to be removed in 0.10.0. See https://github.com/druid-io/druid/issues/3588.
+   */
+  @Deprecated String getName();
   void close();
 
   long getLong();

processing/src/main/java/io/druid/query/aggregation/AggregatorFactory.java

@@ -29,9 +29,9 @@ import java.util.Map;
 
 /**
  * Processing related interface
- * 
+ *
  * An AggregatorFactory is an object that knows how to generate an Aggregator using a ColumnSelectorFactory.
- * 
+ *
  * This is useful as an abstraction to allow Aggregator classes to be written in terms of MetricSelector objects
  * without making any assumptions about how they are pulling values out of the base data.  That is, the data is
  * provided to the Aggregator through the MetricSelector object, so whatever creates that object gets to choose how
@@ -78,7 +78,10 @@ public abstract class AggregatorFactory
    */
   public AggregatorFactory getMergingFactory(AggregatorFactory other) throws AggregatorFactoryNotMergeableException
   {
-    throw new UnsupportedOperationException(String.format("[%s] does not implement getMergingFactory(..)", this.getClass().getName()));
+    throw new UnsupportedOperationException(String.format(
+        "[%s] does not implement getMergingFactory(..)",
+        this.getClass().getName()
+    ));
   }
 
   /**
@@ -124,11 +127,13 @@ public abstract class AggregatorFactory
   public abstract int getMaxIntermediateSize();
 
   /**
-   * Returns the starting value for a corresponding aggregator. For example, 0 for sums, - Infinity for max, an empty mogrifier
+   * Deprecated, to be removed in 0.10.0. See https://github.com/druid-io/druid/issues/3588.
-   *
-   * @return the starting value for a corresponding aggregator.
    */
-  public abstract Object getAggregatorStartValue();
+  @Deprecated
+  public Object getAggregatorStartValue()
+  {
+    throw new UnsupportedOperationException("getAggregatorStartValue is deprecated");
+  }
 
   /**
    * Merges the list of AggregatorFactory[] (presumable from metadata of some segments being merged) and

processing/src/main/java/io/druid/query/aggregation/Aggregators.java

@@ -56,7 +56,7 @@ public class Aggregators
       @Override
       public String getName()
       {
-        return null;
+        throw new UnsupportedOperationException("getName is deprecated");
       }
 
       @Override

processing/src/main/java/io/druid/query/aggregation/CountAggregator.java

@@ -32,12 +32,10 @@ public class CountAggregator implements Aggregator
     return ((Number) lhs).longValue() + ((Number) rhs).longValue();
   }
 
-  long count = 0;
+  private long count = 0;
-  private final String name;
 
-  public CountAggregator(String name)
+  public CountAggregator()
   {
-    this.name = name;
   }
 
   @Override
@@ -73,13 +71,13 @@ public class CountAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new CountAggregator(name);
+    return new CountAggregator();
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/CountAggregatorFactory.java

@@ -50,7 +50,7 @@ public class CountAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new CountAggregator(name);
+    return new CountAggregator();
   }
 
   @Override
@@ -126,12 +126,6 @@ public class CountAggregatorFactory extends AggregatorFactory
     return Longs.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return 0;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/DoubleMaxAggregator.java

@@ -35,13 +35,11 @@ public class DoubleMaxAggregator implements Aggregator
   }
 
   private final FloatColumnSelector selector;
-  private final String name;
 
   private double max;
 
-  public DoubleMaxAggregator(String name, FloatColumnSelector selector)
+  public DoubleMaxAggregator(FloatColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     reset();
@@ -80,13 +78,13 @@ public class DoubleMaxAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new DoubleMaxAggregator(name, selector);
+    return new DoubleMaxAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/DoubleMaxAggregatorFactory.java

@@ -23,7 +23,6 @@ import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.base.Preconditions;
 import com.google.common.primitives.Doubles;
-
 import io.druid.common.utils.StringUtils;
 import io.druid.math.expr.Parser;
 import io.druid.segment.ColumnSelectorFactory;
@@ -71,7 +70,7 @@ public class DoubleMaxAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new DoubleMaxAggregator(name, getFloatColumnSelector(metricFactory));
+    return new DoubleMaxAggregator(getFloatColumnSelector(metricFactory));
   }
 
   @Override
@@ -186,12 +185,6 @@ public class DoubleMaxAggregatorFactory extends AggregatorFactory
     return Doubles.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return Double.NEGATIVE_INFINITY;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/DoubleMinAggregator.java

@@ -35,13 +35,11 @@ public class DoubleMinAggregator implements Aggregator
   }
 
   private final FloatColumnSelector selector;
-  private final String name;
 
   private double min;
 
-  public DoubleMinAggregator(String name, FloatColumnSelector selector)
+  public DoubleMinAggregator(FloatColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     reset();
@@ -80,13 +78,13 @@ public class DoubleMinAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new DoubleMinAggregator(name, selector);
+    return new DoubleMinAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/DoubleMinAggregatorFactory.java

@@ -23,7 +23,6 @@ import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.base.Preconditions;
 import com.google.common.primitives.Doubles;
-
 import io.druid.common.utils.StringUtils;
 import io.druid.math.expr.Parser;
 import io.druid.segment.ColumnSelectorFactory;
@@ -71,7 +70,7 @@ public class DoubleMinAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new DoubleMinAggregator(name, getFloatColumnSelector(metricFactory));
+    return new DoubleMinAggregator(getFloatColumnSelector(metricFactory));
   }
 
   @Override
@@ -186,12 +185,6 @@ public class DoubleMinAggregatorFactory extends AggregatorFactory
     return Doubles.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return Double.POSITIVE_INFINITY;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/DoubleSumAggregator.java

@@ -44,13 +44,11 @@ public class DoubleSumAggregator implements Aggregator
   }
 
   private final FloatColumnSelector selector;
-  private final String name;
 
   private double sum;
 
-  public DoubleSumAggregator(String name, FloatColumnSelector selector)
+  public DoubleSumAggregator(FloatColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     this.sum = 0;
@@ -89,13 +87,13 @@ public class DoubleSumAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new DoubleSumAggregator(name, selector);
+    return new DoubleSumAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/DoubleSumAggregatorFactory.java

@@ -70,7 +70,7 @@ public class DoubleSumAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new DoubleSumAggregator(name, getFloatColumnSelector(metricFactory));
+    return new DoubleSumAggregator(getFloatColumnSelector(metricFactory));
   }
 
   @Override
@@ -185,12 +185,6 @@ public class DoubleSumAggregatorFactory extends AggregatorFactory
     return Doubles.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return 0;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/FilteredAggregator.java

@@ -67,7 +67,7 @@ public class FilteredAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return delegate.getName();
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/FilteredAggregatorFactory.java

@@ -152,12 +152,6 @@ public class FilteredAggregatorFactory extends AggregatorFactory
     return delegate.getMaxIntermediateSize();
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return delegate.getAggregatorStartValue();
-  }
-
   @JsonProperty
   public AggregatorFactory getAggregator()
   {

processing/src/main/java/io/druid/query/aggregation/HistogramAggregator.java

@@ -35,17 +35,17 @@ public class HistogramAggregator implements Aggregator
     }
   };
 
-  static Object combineHistograms(Object lhs, Object rhs) {
+  static Object combineHistograms(Object lhs, Object rhs)
+  {
     return ((Histogram) lhs).fold((Histogram) rhs);
   }
 
   private final FloatColumnSelector selector;
-  private final String name;
 
   private Histogram histogram;
 
-  public HistogramAggregator(String name, FloatColumnSelector selector, float[] breaks) {
+  public HistogramAggregator(FloatColumnSelector selector, float[] breaks)
-    this.name = name;
+  {
     this.selector = selector;
     this.histogram = new Histogram(breaks);
   }
@@ -83,7 +83,7 @@ public class HistogramAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/HistogramAggregatorFactory.java

@@ -66,11 +66,7 @@ public class HistogramAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new HistogramAggregator(
+    return new HistogramAggregator(metricFactory.makeFloatColumnSelector(fieldName), breaks);
-        name,
-        metricFactory.makeFloatColumnSelector(fieldName),
-        breaks
-    );
   }
 
   @Override
@@ -159,7 +155,7 @@ public class HistogramAggregatorFactory extends AggregatorFactory
         .allocate(1 + fieldNameBytes.length + Floats.BYTES * breaks.length)
         .put(CACHE_TYPE_ID)
         .put(fieldNameBytes)
-        .put((byte)0xFF);
+        .put((byte) 0xFF);
     buf.asFloatBuffer().put(breaks);
 
     return buf.array();
@@ -177,12 +173,6 @@ public class HistogramAggregatorFactory extends AggregatorFactory
     return Longs.BYTES * (breaks.length + 1) + Floats.BYTES * 2;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return new Histogram(breaks);
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/JavaScriptAggregator.java

@@ -37,15 +37,13 @@ public class JavaScriptAggregator implements Aggregator
     public void close();
   }
 
-  private final String name;
   private final ObjectColumnSelector[] selectorList;
   private final ScriptAggregator script;
 
   private volatile double current;
 
-  public JavaScriptAggregator(String name, List<ObjectColumnSelector> selectorList, ScriptAggregator script)
+  public JavaScriptAggregator(List<ObjectColumnSelector> selectorList, ScriptAggregator script)
   {
-    this.name = name;
     this.selectorList = Lists.newArrayList(selectorList).toArray(new ObjectColumnSelector[]{});
     this.script = script;
 
@@ -85,7 +83,7 @@ public class JavaScriptAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/JavaScriptAggregatorFactory.java

@@ -96,7 +96,6 @@ public class JavaScriptAggregatorFactory extends AggregatorFactory
   public Aggregator factorize(final ColumnSelectorFactory columnFactory)
   {
     return new JavaScriptAggregator(
-        name,
         Lists.transform(
             fieldNames,
             new com.google.common.base.Function<String, ObjectColumnSelector>()
@@ -263,12 +262,6 @@ public class JavaScriptAggregatorFactory extends AggregatorFactory
     return Doubles.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return getCompiledScript().reset();
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/LongMaxAggregator.java

@@ -35,13 +35,11 @@ public class LongMaxAggregator implements Aggregator
   }
 
   private final LongColumnSelector selector;
-  private final String name;
 
   private long max;
 
-  public LongMaxAggregator(String name, LongColumnSelector selector)
+  public LongMaxAggregator(LongColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     reset();
@@ -80,13 +78,13 @@ public class LongMaxAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new LongMaxAggregator(name, selector);
+    return new LongMaxAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/LongMaxAggregatorFactory.java

@@ -54,7 +54,8 @@ public class LongMaxAggregatorFactory extends AggregatorFactory
     Preconditions.checkNotNull(name, "Must have a valid, non-null aggregator name");
     Preconditions.checkArgument(
         fieldName == null ^ expression == null,
-        "Must have a valid, non-null fieldName or expression");
+        "Must have a valid, non-null fieldName or expression"
+    );
 
     this.name = name;
     this.fieldName = fieldName;
@@ -69,7 +70,7 @@ public class LongMaxAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new LongMaxAggregator(name, getLongColumnSelector(metricFactory));
+    return new LongMaxAggregator(getLongColumnSelector(metricFactory));
   }
 
   @Override
@@ -180,12 +181,6 @@ public class LongMaxAggregatorFactory extends AggregatorFactory
     return Longs.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return Long.MIN_VALUE;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/LongMinAggregator.java

@@ -35,13 +35,11 @@ public class LongMinAggregator implements Aggregator
   }
 
   private final LongColumnSelector selector;
-  private final String name;
 
   private long min;
 
-  public LongMinAggregator(String name, LongColumnSelector selector)
+  public LongMinAggregator(LongColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     reset();
@@ -80,13 +78,13 @@ public class LongMinAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return this.name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new LongMinAggregator(name, selector);
+    return new LongMinAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/LongMinAggregatorFactory.java

@@ -54,7 +54,8 @@ public class LongMinAggregatorFactory extends AggregatorFactory
     Preconditions.checkNotNull(name, "Must have a valid, non-null aggregator name");
     Preconditions.checkArgument(
         fieldName == null ^ expression == null,
-        "Must have a valid, non-null fieldName or expression");
+        "Must have a valid, non-null fieldName or expression"
+    );
 
     this.name = name;
     this.fieldName = fieldName;
@@ -69,7 +70,7 @@ public class LongMinAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new LongMinAggregator(name, getLongColumnSelector(metricFactory));
+    return new LongMinAggregator(getLongColumnSelector(metricFactory));
   }
 
   @Override
@@ -180,12 +181,6 @@ public class LongMinAggregatorFactory extends AggregatorFactory
     return Longs.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return Long.MAX_VALUE;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/LongSumAggregator.java

@@ -37,18 +37,17 @@ public class LongSumAggregator implements Aggregator
     }
   };
 
-  static long combineValues(Object lhs, Object rhs) {
+  static long combineValues(Object lhs, Object rhs)
+  {
     return ((Number) lhs).longValue() + ((Number) rhs).longValue();
   }
 
   private final LongColumnSelector selector;
-  private final String name;
 
   private long sum;
 
-  public LongSumAggregator(String name, LongColumnSelector selector)
+  public LongSumAggregator(LongColumnSelector selector)
   {
-    this.name = name;
     this.selector = selector;
 
     this.sum = 0;
@@ -87,13 +86,13 @@ public class LongSumAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new LongSumAggregator(name, selector);
+    return new LongSumAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/LongSumAggregatorFactory.java

@@ -54,7 +54,8 @@ public class LongSumAggregatorFactory extends AggregatorFactory
     Preconditions.checkNotNull(name, "Must have a valid, non-null aggregator name");
     Preconditions.checkArgument(
         fieldName == null ^ expression == null,
-        "Must have a valid, non-null fieldName or expression");
+        "Must have a valid, non-null fieldName or expression"
+    );
 
     this.name = name;
     this.fieldName = fieldName;
@@ -69,7 +70,7 @@ public class LongSumAggregatorFactory extends AggregatorFactory
   @Override
   public Aggregator factorize(ColumnSelectorFactory metricFactory)
   {
-    return new LongSumAggregator(name, getLongColumnSelector(metricFactory));
+    return new LongSumAggregator(getLongColumnSelector(metricFactory));
   }
 
   @Override
@@ -180,12 +181,6 @@ public class LongSumAggregatorFactory extends AggregatorFactory
     return Longs.BYTES;
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return 0;
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/aggregation/cardinality/CardinalityAggregator.java

@@ -34,7 +34,6 @@ public class CardinalityAggregator implements Aggregator
 {
   private static final String NULL_STRING = "\u0000";
 
-  private final String name;
   private final List<DimensionSelector> selectorList;
   private final boolean byRow;
 
@@ -87,12 +86,10 @@ public class CardinalityAggregator implements Aggregator
   private HyperLogLogCollector collector;
 
   public CardinalityAggregator(
-      String name,
       List<DimensionSelector> selectorList,
       boolean byRow
   )
   {
-    this.name = name;
     this.selectorList = selectorList;
     this.collector = HyperLogLogCollector.makeLatestCollector();
     this.byRow = byRow;
@@ -135,13 +132,13 @@ public class CardinalityAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new CardinalityAggregator(name, selectorList, byRow);
+    return new CardinalityAggregator(selectorList, byRow);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/cardinality/CardinalityAggregatorFactory.java

@@ -139,7 +139,7 @@ public class CardinalityAggregatorFactory extends AggregatorFactory
       return Aggregators.noopAggregator();
     }
 
-    return new CardinalityAggregator(name, selectors, byRow);
+    return new CardinalityAggregator(selectors, byRow);
   }
 
 
@@ -310,12 +310,6 @@ public class CardinalityAggregatorFactory extends AggregatorFactory
     return HyperLogLogCollector.getLatestNumBytesForDenseStorage();
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return HyperLogLogCollector.makeLatestCollector();
-  }
-
   @Override
   public boolean equals(Object o)
   {

processing/src/main/java/io/druid/query/aggregation/hyperloglog/HyperUniquesAggregator.java

@@ -26,17 +26,14 @@ import io.druid.segment.ObjectColumnSelector;
  */
 public class HyperUniquesAggregator implements Aggregator
 {
-  private final String name;
   private final ObjectColumnSelector selector;
 
   private HyperLogLogCollector collector;
 
   public HyperUniquesAggregator(
-      String name,
       ObjectColumnSelector selector
   )
   {
-    this.name = name;
     this.selector = selector;
 
     this.collector = HyperLogLogCollector.makeLatestCollector();
@@ -76,13 +73,13 @@ public class HyperUniquesAggregator implements Aggregator
   @Override
   public String getName()
   {
-    return name;
+    throw new UnsupportedOperationException("getName is deprecated");
   }
 
   @Override
   public Aggregator clone()
   {
-    return new HyperUniquesAggregator(name, selector);
+    return new HyperUniquesAggregator(selector);
   }
 
   @Override

processing/src/main/java/io/druid/query/aggregation/hyperloglog/HyperUniquesAggregatorFactory.java

@@ -77,7 +77,7 @@ public class HyperUniquesAggregatorFactory extends AggregatorFactory
 
     final Class classOfObject = selector.classOfObject();
     if (classOfObject.equals(Object.class) || HyperLogLogCollector.class.isAssignableFrom(classOfObject)) {
-      return new HyperUniquesAggregator(name, selector);
+      return new HyperUniquesAggregator(selector);
     }
 
     throw new IAE(
@@ -209,12 +209,6 @@ public class HyperUniquesAggregatorFactory extends AggregatorFactory
     return HyperLogLogCollector.getLatestNumBytesForDenseStorage();
   }
 
-  @Override
-  public Object getAggregatorStartValue()
-  {
-    return HyperLogLogCollector.makeLatestCollector();
-  }
-
   @Override
   public String toString()
   {

processing/src/main/java/io/druid/query/timeseries/TimeseriesQueryEngine.java

@@ -61,7 +61,13 @@ public class TimeseriesQueryEngine
           @Override
           public Result<TimeseriesResultValue> apply(Cursor cursor)
           {
-            Aggregator[] aggregators = QueryRunnerHelper.makeAggregators(cursor, aggregatorSpecs);
+            Aggregator[] aggregators = new Aggregator[aggregatorSpecs.size()];
+            String[] aggregatorNames = new String[aggregatorSpecs.size()];
+
+            for (int i = 0; i < aggregatorSpecs.size(); i++) {
+              aggregators[i] = aggregatorSpecs.get(i).factorize(cursor);
+              aggregatorNames[i] = aggregatorSpecs.get(i).getName();
+            }
 
             if (skipEmptyBuckets && cursor.isDone()) {
               return null;
@@ -77,8 +83,8 @@ public class TimeseriesQueryEngine
 
               TimeseriesResultBuilder bob = new TimeseriesResultBuilder(cursor.getTime());
 
-              for (Aggregator aggregator : aggregators) {
+              for (int i = 0; i < aggregatorSpecs.size(); i++) {
-                bob.addMetric(aggregator);
+                bob.addMetric(aggregatorNames[i], aggregators[i]);
               }
 
               Result<TimeseriesResultValue> retVal = bob.build();

processing/src/main/java/io/druid/query/timeseries/TimeseriesResultBuilder.java

@@ -42,15 +42,9 @@ public class TimeseriesResultBuilder
     this.timestamp = timestamp;
   }
 
-  public TimeseriesResultBuilder addMetric(Aggregator aggregator)
+  public TimeseriesResultBuilder addMetric(String name, Aggregator aggregator)
   {
-    metricValues.put(aggregator.getName(), aggregator.get());
+    metricValues.put(name, aggregator.get());
-    return this;
-  }
-
-  public TimeseriesResultBuilder addMetric(PostAggregator postAggregator)
-  {
-    metricValues.put(postAggregator.getName(), postAggregator.compute(metricValues));
     return this;
   }
 

processing/src/main/java/io/druid/segment/incremental/OnheapIncrementalIndex.java

@@ -179,11 +179,11 @@ public class OnheapIncrementalIndex extends IncrementalIndex<Aggregator>
 
     if (null != priorIndex) {
       aggs = concurrentGet(priorIndex);
-      doAggregate(aggs, rowContainer, row, reportParseExceptions);
+      doAggregate(metrics, aggs, rowContainer, row, reportParseExceptions);
     } else {
       aggs = new Aggregator[metrics.length];
       factorizeAggs(metrics, aggs, rowContainer, row);
-      doAggregate(aggs, rowContainer, row, reportParseExceptions);
+      doAggregate(metrics, aggs, rowContainer, row, reportParseExceptions);
 
       final Integer rowIndex = indexIncrement.getAndIncrement();
       concurrentSet(rowIndex, aggs);
@@ -198,7 +198,7 @@ public class OnheapIncrementalIndex extends IncrementalIndex<Aggregator>
       } else {
         // We lost a race
         aggs = concurrentGet(prev);
-        doAggregate(aggs, rowContainer, row, reportParseExceptions);
+        doAggregate(metrics, aggs, rowContainer, row, reportParseExceptions);
         // Free up the misfire
         concurrentRemove(rowIndex);
         // This is expected to occur ~80% of the time in the worst scenarios
@@ -224,6 +224,7 @@ public class OnheapIncrementalIndex extends IncrementalIndex<Aggregator>
   }
 
   private void doAggregate(
+      AggregatorFactory[] metrics,
       Aggregator[] aggs,
       ThreadLocal<InputRow> rowContainer,
       InputRow row,
@@ -232,7 +233,8 @@ public class OnheapIncrementalIndex extends IncrementalIndex<Aggregator>
   {
     rowContainer.set(row);
 
-    for (Aggregator agg : aggs) {
+    for (int i = 0 ; i < aggs.length ; i++) {
+      final Aggregator agg = aggs[i];
       synchronized (agg) {
         try {
           agg.aggregate();
@@ -240,9 +242,9 @@ public class OnheapIncrementalIndex extends IncrementalIndex<Aggregator>
         catch (ParseException e) {
           // "aggregate" can throw ParseExceptions if a selector expects something but gets something else.
           if (reportParseExceptions) {
-            throw new ParseException(e, "Encountered parse error for aggregator[%s]", agg.getName());
+            throw new ParseException(e, "Encountered parse error for aggregator[%s]", metrics[i].getName());
           } else {
-            log.debug(e, "Encountered parse error, skipping aggregator[%s].", agg.getName());
+            log.debug(e, "Encountered parse error, skipping aggregator[%s].", metrics[i].getName());
           }
         }
       }

processing/src/test/java/io/druid/query/aggregation/CountAggregatorTest.java

@@ -31,9 +31,7 @@ public class CountAggregatorTest
   @Test
   public void testAggregate()
   {
-    CountAggregator agg = new CountAggregator("billy");
+    CountAggregator agg = new CountAggregator();
-
-    Assert.assertEquals("billy", agg.getName());
 
     Assert.assertEquals(0L, agg.get());
     Assert.assertEquals(0L, agg.get());
@@ -51,7 +49,7 @@ public class CountAggregatorTest
   @Test
   public void testComparator()
   {
-    CountAggregator agg = new CountAggregator("billy");
+    CountAggregator agg = new CountAggregator();
 
     Object first = agg.get();
     agg.aggregate();

processing/src/test/java/io/druid/query/aggregation/DoubleMaxAggregationTest.java

@@ -59,8 +59,6 @@ public class DoubleMaxAggregationTest
   {
     DoubleMaxAggregator agg = (DoubleMaxAggregator) doubleMaxAggFactory.factorize(colSelectorFactory);
 
-    Assert.assertEquals("billy", agg.getName());
-
     aggregate(selector, agg);
     aggregate(selector, agg);
     aggregate(selector, agg);

processing/src/test/java/io/druid/query/aggregation/DoubleMinAggregationTest.java

@@ -59,8 +59,6 @@ public class DoubleMinAggregationTest
   {
     DoubleMinAggregator agg = (DoubleMinAggregator) doubleMinAggFactory.factorize(colSelectorFactory);
 
-    Assert.assertEquals("billy", agg.getName());
-
     aggregate(selector, agg);
     aggregate(selector, agg);
     aggregate(selector, agg);

processing/src/test/java/io/druid/query/aggregation/DoubleSumAggregatorTest.java

@@ -39,9 +39,7 @@ public class DoubleSumAggregatorTest
   {
     final float[] values = {0.15f, 0.27f};
     final TestFloatColumnSelector selector = new TestFloatColumnSelector(values);
-    DoubleSumAggregator agg = new DoubleSumAggregator("billy", selector);
+    DoubleSumAggregator agg = new DoubleSumAggregator(selector);
-
-    Assert.assertEquals("billy", agg.getName());
 
     double expectedFirst = new Float(values[0]).doubleValue();
     double expectedSecond = new Float(values[1]).doubleValue() + expectedFirst;
@@ -63,9 +61,7 @@ public class DoubleSumAggregatorTest
   public void testComparator()
   {
     final TestFloatColumnSelector selector = new TestFloatColumnSelector(new float[]{0.15f, 0.27f});
-    DoubleSumAggregator agg = new DoubleSumAggregator("billy", selector);
+    DoubleSumAggregator agg = new DoubleSumAggregator(selector);
-
-    Assert.assertEquals("billy", agg.getName());
 
     Object first = agg.get();
     agg.aggregate();

processing/src/test/java/io/druid/query/aggregation/FilteredAggregatorTest.java

@@ -75,8 +75,6 @@ public class FilteredAggregatorTest
      makeColumnSelector(selector)
     );
 
-    Assert.assertEquals("billy", agg.getName());
-
     double expectedFirst = new Float(values[0]).doubleValue();
     double expectedSecond = new Float(values[1]).doubleValue() + expectedFirst;
     double expectedThird = expectedSecond;
@@ -235,8 +233,6 @@ public class FilteredAggregatorTest
         makeColumnSelector(selector)
     );
 
-    Assert.assertEquals("billy", agg.getName());
-
     double expectedFirst = new Float(values[0]).doubleValue();
     double expectedSecond = new Float(values[1]).doubleValue() + expectedFirst;
     double expectedThird = expectedSecond + new Float(values[2]).doubleValue();
@@ -359,8 +355,6 @@ public class FilteredAggregatorTest
         makeColumnSelector(selector)
     );
 
-    Assert.assertEquals("billy", agg.getName());
-
     double expectedFirst = new Float(values[0]).doubleValue();
     double expectedSecond = new Float(values[1]).doubleValue() + expectedFirst;
     double expectedThird = expectedSecond;

processing/src/test/java/io/druid/query/aggregation/HistogramAggregatorTest.java

@@ -59,9 +59,7 @@ public class HistogramAggregatorTest
 
     final TestFloatColumnSelector selector = new TestFloatColumnSelector(values);
 
-    HistogramAggregator agg = new HistogramAggregator("billy", selector, breaks);
+    HistogramAggregator agg = new HistogramAggregator(selector, breaks);
-
-    Assert.assertEquals("billy", agg.getName());
 
     Assert.assertArrayEquals(new long[]{0,0,0,0,0,0}, ((Histogram)agg.get()).bins);
     Assert.assertArrayEquals(new long[]{0,0,0,0,0,0}, ((Histogram)agg.get()).bins);

processing/src/test/java/io/druid/query/aggregation/JavaScriptAggregatorBenchmark.java

@@ -53,7 +53,6 @@ public class JavaScriptAggregatorBenchmark extends SimpleBenchmark
     Map<String, String> script = scriptDoubleSum;
 
     jsAggregator = new JavaScriptAggregator(
-        "billy",
         Lists.asList(MetricSelectorUtils.wrap(selector), new ObjectColumnSelector[]{}),
         JavaScriptAggregatorFactory.compileScript(
             script.get("fnAggregate"),
@@ -62,7 +61,7 @@ public class JavaScriptAggregatorBenchmark extends SimpleBenchmark
         )
     );
 
-    doubleAgg = new DoubleSumAggregator("billy", selector);
+    doubleAgg = new DoubleSumAggregator(selector);
   }
 
   public double timeJavaScriptDoubleSum(int reps)

processing/src/test/java/io/druid/query/aggregation/JavaScriptAggregatorTest.java

@@ -138,7 +138,6 @@ public class JavaScriptAggregatorTest
     Map<String, String> script = sumLogATimesBPlusTen;
 
     JavaScriptAggregator agg = new JavaScriptAggregator(
-        "billy",
         Arrays.<ObjectColumnSelector>asList(MetricSelectorUtils.wrap(selector1), MetricSelectorUtils.wrap(selector2)),
         JavaScriptAggregatorFactory.compileScript(
             script.get("fnAggregate"),
@@ -149,8 +148,6 @@ public class JavaScriptAggregatorTest
 
     agg.reset();
 
-    Assert.assertEquals("billy", agg.getName());
-
     double val = 10.;
     Assert.assertEquals(val, agg.get());
     Assert.assertEquals(val, agg.get());
@@ -213,7 +210,6 @@ public class JavaScriptAggregatorTest
     Map<String, String> script = scriptDoubleSum;
 
     JavaScriptAggregator agg = new JavaScriptAggregator(
-        "billy",
         Collections.<ObjectColumnSelector>singletonList(null),
         JavaScriptAggregatorFactory.compileScript(
             script.get("fnAggregate"),
@@ -224,8 +220,6 @@ public class JavaScriptAggregatorTest
 
     final double val = 0;
 
-    Assert.assertEquals("billy", agg.getName());
-
     agg.reset();
     Assert.assertEquals(val, agg.get());
     Assert.assertEquals(val, agg.get());
@@ -247,7 +241,6 @@ public class JavaScriptAggregatorTest
   {
     final TestObjectColumnSelector ocs = new TestObjectColumnSelector("what", null, new String[]{"hey", "there"});
     final JavaScriptAggregator agg = new JavaScriptAggregator(
-        "billy",
         Collections.<ObjectColumnSelector>singletonList(ocs),
         JavaScriptAggregatorFactory.compileScript(
             "function aggregate(current, a) { if (Array.isArray(a)) { return current + a.length; } else if (typeof a === 'string') { return current + 1; } else { return current; } }",
@@ -258,8 +251,6 @@ public class JavaScriptAggregatorTest
 
     agg.reset();
 
-    Assert.assertEquals("billy", agg.getName());
-
     double val = 0.;
     Assert.assertEquals(val, agg.get());
     Assert.assertEquals(val, agg.get());
@@ -343,7 +334,6 @@ public class JavaScriptAggregatorTest
 
     Map<String, String> script = scriptDoubleSum;
     JavaScriptAggregator aggRhino = new JavaScriptAggregator(
-        "billy",
         Lists.asList(MetricSelectorUtils.wrap(selector), new ObjectColumnSelector[]{}),
         JavaScriptAggregatorFactory.compileScript(
             script.get("fnAggregate"),
@@ -352,7 +342,7 @@ public class JavaScriptAggregatorTest
         )
     );
 
-    DoubleSumAggregator doubleAgg = new DoubleSumAggregator("billy", selector);
+    DoubleSumAggregator doubleAgg = new DoubleSumAggregator(selector);
 
     // warmup
     int i = 0;

processing/src/test/java/io/druid/query/aggregation/LongMaxAggregationTest.java

@@ -59,8 +59,6 @@ public class LongMaxAggregationTest
   {
     LongMaxAggregator agg = (LongMaxAggregator)longMaxAggFactory.factorize(colSelectorFactory);
 
-    Assert.assertEquals("billy", agg.getName());
-
     aggregate(selector, agg);
     aggregate(selector, agg);
     aggregate(selector, agg);

processing/src/test/java/io/druid/query/aggregation/LongMinAggregationTest.java

@@ -59,8 +59,6 @@ public class LongMinAggregationTest
   {
     LongMinAggregator agg = (LongMinAggregator)longMinAggFactory.factorize(colSelectorFactory);
 
-    Assert.assertEquals("billy", agg.getName());
-
     aggregate(selector, agg);
     aggregate(selector, agg);
     aggregate(selector, agg);

processing/src/test/java/io/druid/query/aggregation/LongSumAggregatorTest.java

@@ -38,9 +38,7 @@ public class LongSumAggregatorTest
   public void testAggregate()
   {
     final TestLongColumnSelector selector = new TestLongColumnSelector(new long[]{24L, 20L});
-    LongSumAggregator agg = new LongSumAggregator("billy", selector);
+    LongSumAggregator agg = new LongSumAggregator(selector);
-
-    Assert.assertEquals("billy", agg.getName());
 
     Assert.assertEquals(0L, agg.get());
     Assert.assertEquals(0L, agg.get());
@@ -59,9 +57,7 @@ public class LongSumAggregatorTest
   public void testComparator()
   {
     final TestLongColumnSelector selector = new TestLongColumnSelector(new long[]{18293L});
-    LongSumAggregator agg = new LongSumAggregator("billy", selector);
+    LongSumAggregator agg = new LongSumAggregator(selector);
-
-    Assert.assertEquals("billy", agg.getName());
 
     Object first = agg.get();
     agg.aggregate();

processing/src/test/java/io/druid/query/aggregation/MetricManipulatorFnsTest.java

@@ -42,14 +42,14 @@ public class MetricManipulatorFnsTest
     final ArrayList<Object[]> constructorArrays = new ArrayList<>();
     final long longVal = 13789;
     LongMinAggregator longMinAggregator = new LongMinAggregator(
-        NAME, new LongColumnSelector()
+        new LongColumnSelector()
-    {
+        {
-      @Override
+          @Override
-      public long get()
+          public long get()
-      {
+          {
-        return longVal;
+            return longVal;
-      }
+          }
-    }
+        }
     );
     LongMinAggregatorFactory longMinAggregatorFactory = new LongMinAggregatorFactory(NAME, FIELD);
     constructorArrays.add(
@@ -81,14 +81,14 @@ public class MetricManipulatorFnsTest
 
     LongSumAggregatorFactory longSumAggregatorFactory = new LongSumAggregatorFactory(NAME, FIELD);
     LongSumAggregator longSumAggregator = new LongSumAggregator(
-        NAME, new LongColumnSelector()
+        new LongColumnSelector()
-    {
+        {
-      @Override
+          @Override
-      public long get()
+          public long get()
-      {
+          {
-        return longVal;
+            return longVal;
-      }
+          }
-    }
+        }
     );
     constructorArrays.add(
         new Object[]{

processing/src/test/java/io/druid/query/aggregation/cardinality/CardinalityAggregatorTest.java

@@ -310,7 +310,6 @@ public class CardinalityAggregatorTest
   public void testAggregateRows() throws Exception
   {
     CardinalityAggregator agg = new CardinalityAggregator(
-        "billy",
         selectorList,
         true
     );
@@ -326,7 +325,6 @@ public class CardinalityAggregatorTest
   public void testAggregateValues() throws Exception
   {
     CardinalityAggregator agg = new CardinalityAggregator(
-        "billy",
         selectorList,
         false
     );
@@ -385,8 +383,8 @@ public class CardinalityAggregatorTest
     List<DimensionSelector> selector1 = Lists.newArrayList((DimensionSelector) dim1);
     List<DimensionSelector> selector2 = Lists.newArrayList((DimensionSelector) dim2);
 
-    CardinalityAggregator agg1 = new CardinalityAggregator("billy", selector1, true);
+    CardinalityAggregator agg1 = new CardinalityAggregator(selector1, true);
-    CardinalityAggregator agg2 = new CardinalityAggregator("billy", selector2, true);
+    CardinalityAggregator agg2 = new CardinalityAggregator(selector2, true);
 
     for (int i = 0; i < values1.size(); ++i) {
       aggregate(selector1, agg1);
@@ -416,8 +414,8 @@ public class CardinalityAggregatorTest
     List<DimensionSelector> selector1 = Lists.newArrayList((DimensionSelector) dim1);
     List<DimensionSelector> selector2 = Lists.newArrayList((DimensionSelector) dim2);
 
-    CardinalityAggregator agg1 = new CardinalityAggregator("billy", selector1, false);
+    CardinalityAggregator agg1 = new CardinalityAggregator(selector1, false);
-    CardinalityAggregator agg2 = new CardinalityAggregator("billy", selector2, false);
+    CardinalityAggregator agg2 = new CardinalityAggregator(selector2, false);
 
     for (int i = 0; i < values1.size(); ++i) {
       aggregate(selector1, agg1);
@@ -445,7 +443,6 @@ public class CardinalityAggregatorTest
   public void testAggregateRowsWithExtraction() throws Exception
   {
     CardinalityAggregator agg = new CardinalityAggregator(
-        "billy",
         selectorListWithExtraction,
         true
     );
@@ -455,7 +452,6 @@ public class CardinalityAggregatorTest
     Assert.assertEquals(9.0, (Double) rowAggregatorFactory.finalizeComputation(agg.get()), 0.05);
 
     CardinalityAggregator agg2 = new CardinalityAggregator(
-        "billy",
         selectorListConstantVal,
         true
     );
@@ -469,7 +465,6 @@ public class CardinalityAggregatorTest
   public void testAggregateValuesWithExtraction() throws Exception
   {
     CardinalityAggregator agg = new CardinalityAggregator(
-        "billy",
         selectorListWithExtraction,
         false
     );
@@ -479,7 +474,6 @@ public class CardinalityAggregatorTest
     Assert.assertEquals(7.0, (Double) valueAggregatorFactory.finalizeComputation(agg.get()), 0.05);
 
     CardinalityAggregator agg2 = new CardinalityAggregator(
-        "billy",
         selectorListConstantVal,
         false
     );

processing/src/test/java/io/druid/query/aggregation/hyperloglog/HyperUniquesAggregatorFactoryTest.java

@@ -36,13 +36,4 @@ public class HyperUniquesAggregatorFactoryTest
     Object v0 = aggregatorFactory.deserialize(V0_BASE64);
     Assert.assertEquals("deserialized value is HLLCV0", HLLCV0.class, v0.getClass());
   }
-
-  @Test
-  public void testCombineStartValueV0() throws Exception
-  {
-    Object combined = aggregatorFactory.getAggregatorStartValue();
-    aggregatorFactory.combine(combined, aggregatorFactory.deserialize(V0_BASE64));
-  }
-
-
 }

processing/src/test/java/io/druid/query/aggregation/post/ArithmeticPostAggregatorTest.java

@@ -39,14 +39,15 @@ public class ArithmeticPostAggregatorTest
   @Test
   public void testCompute()
   {
+    final String aggName = "rows";
     ArithmeticPostAggregator arithmeticPostAggregator;
     ExpressionPostAggregator expressionPostAggregator;
-    CountAggregator agg = new CountAggregator("rows");
+    CountAggregator agg = new CountAggregator();
     agg.aggregate();
     agg.aggregate();
     agg.aggregate();
     Map<String, Object> metricValues = new HashMap<String, Object>();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put(aggName, agg.get());
 
     List<PostAggregator> postAggregatorList =
         Lists.newArrayList(
@@ -86,10 +87,11 @@ public class ArithmeticPostAggregatorTest
   @Test
   public void testComparator()
   {
+    final String aggName = "rows";
     ArithmeticPostAggregator arithmeticPostAggregator;
-    CountAggregator agg = new CountAggregator("rows");
+    CountAggregator agg = new CountAggregator();
     Map<String, Object> metricValues = new HashMap<String, Object>();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put(aggName, agg.get());
 
     List<PostAggregator> postAggregatorList =
         Lists.newArrayList(
@@ -107,7 +109,7 @@ public class ArithmeticPostAggregatorTest
     agg.aggregate();
     agg.aggregate();
     agg.aggregate();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put(aggName, agg.get());
     Object after = arithmeticPostAggregator.compute(metricValues);
 
     Assert.assertEquals(-1, comp.compare(before, after));

processing/src/test/java/io/druid/query/aggregation/post/FieldAccessPostAggregatorTest.java

@@ -33,18 +33,19 @@ public class FieldAccessPostAggregatorTest
   @Test
   public void testCompute()
   {
+    final String aggName = "rows";
     FieldAccessPostAggregator fieldAccessPostAggregator;
 
     fieldAccessPostAggregator = new FieldAccessPostAggregator("To be, or not to be, that is the question:", "rows");
-    CountAggregator agg = new CountAggregator("rows");
+    CountAggregator agg = new CountAggregator();
     Map<String, Object> metricValues = new HashMap<String, Object>();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put(aggName, agg.get());
     Assert.assertEquals(new Long(0L), fieldAccessPostAggregator.compute(metricValues));
 
     agg.aggregate();
     agg.aggregate();
     agg.aggregate();
-    metricValues.put(agg.getName(), agg.get());
+    metricValues.put(aggName, agg.get());
     Assert.assertEquals(new Long(3L), fieldAccessPostAggregator.compute(metricValues));
   }
 }

processing/src/test/java/io/druid/query/spec/SpecificSegmentQueryRunnerTest.java

@@ -142,9 +142,9 @@ public class SpecificSegmentQueryRunnerTest
     TimeseriesResultBuilder builder = new TimeseriesResultBuilder(
         new DateTime("2012-01-01T00:00:00Z")
     );
-    CountAggregator rows = new CountAggregator("rows");
+    CountAggregator rows = new CountAggregator();
     rows.aggregate();
-    builder.addMetric(rows);
+    builder.addMetric("rows", rows);
     final Result<TimeseriesResultValue> value = builder.build();
 
     final SpecificSegmentQueryRunner queryRunner = new SpecificSegmentQueryRunner(