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Diffstat (limited to 'exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/PrelCostEstimates.java')
-rw-r--r-- | exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/PrelCostEstimates.java | 51 |
1 files changed, 51 insertions, 0 deletions
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 new file mode 100644 index 000000000..7cf1b9e11 --- /dev/null +++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/PrelCostEstimates.java @@ -0,0 +1,51 @@ +/* + * 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; + } +}
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