SQL: Remove some unused code. (#5690)

sql/src/main/java/io/druid/sql/calcite/aggregation/DimensionExpression.java

@@ -59,11 +59,6 @@ public class DimensionExpression
     return expression;
   }
 
-  public ValueType getOutputType()
-  {
-    return outputType;
-  }
-
   public DimensionSpec toDimensionSpec()
   {
     if (expression.isSimpleExtraction()) {

sql/src/main/java/io/druid/sql/calcite/aggregation/PostAggregatorFactory.java

@@ -1,57 +0,0 @@
-/*
- * Licensed to Metamarkets Group Inc. (Metamarkets) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. Metamarkets 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 io.druid.sql.calcite.aggregation;
-
-import io.druid.query.aggregation.PostAggregator;
-
-/**
- * Can create PostAggregators with specific output names.
- */
-public abstract class PostAggregatorFactory
-{
-  public abstract PostAggregator factorize(String outputName);
-
-  @Override
-  public boolean equals(Object o)
-  {
-    if (this == o) {
-      return true;
-    }
-    if (o == null || getClass() != o.getClass()) {
-      return false;
-    }
-
-    PostAggregatorFactory that = (PostAggregatorFactory) o;
-
-    return factorize(null).equals(that.factorize(null));
-  }
-
-  @Override
-  public int hashCode()
-  {
-    return factorize(null).hashCode();
-  }
-
-  @Override
-  public String toString()
-  {
-    return factorize(null).toString();
-  }
-}