optimizes SpillingGrouper

Author: maytasm

processing/src/main/java/org/apache/druid/query/groupby/epinephelinae/SpillingGrouper.java

@@ -23,10 +23,10 @@
 import com.fasterxml.jackson.databind.MappingIterator;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializerProvider;
-import com.google.common.collect.AbstractIterator;
 import com.google.common.base.Function;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Supplier;
+import com.google.common.collect.AbstractIterator;
 import com.google.common.collect.Iterators;
 import net.jpountz.lz4.LZ4BlockInputStream;
 import net.jpountz.lz4.LZ4BlockOutputStream;