Use Long.signum() instead of slower Math.signum()

h2/src/main/org/h2/engine/QueryStatisticsData.java

@@ -23,7 +23,7 @@ public class QueryStatisticsData {
             new Comparator<QueryEntry>() {
         @Override
         public int compare(QueryEntry o1, QueryEntry o2) {
-            return (int) Math.signum(o1.lastUpdateTime - o2.lastUpdateTime);
+            return Long.signum(o1.lastUpdateTime - o2.lastUpdateTime);
         }
     };
 

h2/src/main/org/h2/expression/Aggregate.java

@@ -12,7 +12,6 @@ import java.util.HashMap;
 import org.h2.api.ErrorCode;
 import org.h2.command.dml.Select;
 import org.h2.command.dml.SelectOrderBy;
-import org.h2.engine.Database;
 import org.h2.engine.Session;
 import org.h2.index.Cursor;
 import org.h2.index.Index;