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diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/PrelCostEstimates.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/PrelCostEstimates.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF 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 org.apache.drill.exec.planner.cost;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+/**
+ * Cost estimates per physical relation. These cost estimations are computed
+ * during physical planning by the optimizer. These are also used post physical
+ * planning to compute memory requirements in minor fragment generation phase.
+ *
+ */
+@JsonTypeName("cost-estimates")
+public class PrelCostEstimates {
+ // memory requirement for an operator.
+ private final double memoryCost;
+ // number of rows that are output by this operator.
+ private final double outputRowCount;
+
+ public static PrelCostEstimates ZERO_COST = new PrelCostEstimates(0,0);
+
+ public PrelCostEstimates(@JsonProperty("memoryCost") double memory,
+ @JsonProperty("outputRowCount") double rowCount) {
+ this.memoryCost = memory;
+ this.outputRowCount = rowCount;
+ }
+
+ public double getOutputRowCount() {
+ return outputRowCount;
+ }
+
+ public double getMemoryCost() {
+ return memoryCost;
+ }
+} \ No newline at end of file