spark SortDirection 源码
spark SortDirection 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/SortDirection.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.expressions;
import org.apache.spark.annotation.Experimental;
import static org.apache.spark.sql.connector.expressions.NullOrdering.NULLS_FIRST;
import static org.apache.spark.sql.connector.expressions.NullOrdering.NULLS_LAST;
/**
* A sort direction used in sorting expressions.
* <p>
* Each direction has a default null ordering that is implied if no null ordering is specified
* explicitly.
*
* @since 3.2.0
*/
@Experimental
public enum SortDirection {
ASCENDING(NULLS_FIRST), DESCENDING(NULLS_LAST);
private final NullOrdering defaultNullOrdering;
SortDirection(NullOrdering defaultNullOrdering) {
this.defaultNullOrdering = defaultNullOrdering;
}
/**
* Returns the default null ordering to use if no null ordering is specified explicitly.
*/
public NullOrdering defaultNullOrdering() {
return defaultNullOrdering;
}
@Override
public String toString() {
switch (this) {
case ASCENDING:
return "ASC";
case DESCENDING:
return "DESC";
default:
throw new IllegalArgumentException("Unexpected sort direction: " + this);
}
}
}
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