spark Distributions 源码
spark Distributions 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/distributions/Distributions.java
/*
* 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.spark.sql.connector.distributions;
import org.apache.spark.annotation.Experimental;
import org.apache.spark.sql.connector.expressions.Expression;
import org.apache.spark.sql.connector.expressions.SortOrder;
/**
* Helper methods to create distributions to pass into Spark.
*
* @since 3.2.0
*/
@Experimental
public class Distributions {
private Distributions() {
}
/**
* Creates a distribution where no promises are made about co-location of data.
*/
public static UnspecifiedDistribution unspecified() {
return LogicalDistributions.unspecified();
}
/**
* Creates a distribution where tuples that share the same values for clustering expressions are
* co-located in the same partition.
*/
public static ClusteredDistribution clustered(Expression[] clustering) {
return LogicalDistributions.clustered(clustering);
}
/**
* Creates a distribution where tuples have been ordered across partitions according
* to ordering expressions, but not necessarily within a given partition.
*/
public static OrderedDistribution ordered(SortOrder[] ordering) {
return LogicalDistributions.ordered(ordering);
}
}
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