spark GeneralAggregateFunc 源码
spark GeneralAggregateFunc 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/aggregate/GeneralAggregateFunc.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.aggregate;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.expressions.Expression;
import org.apache.spark.sql.internal.connector.ExpressionWithToString;
/**
* The general implementation of {@link AggregateFunc}, which contains the upper-cased function
* name, the `isDistinct` flag and all the inputs. Note that Spark cannot push down partial
* aggregate with this function to the source, but can only push down the entire aggregate.
* <p>
* The currently supported SQL aggregate functions:
* <ol>
* <li><pre>VAR_POP(input1)</pre> Since 3.3.0</li>
* <li><pre>VAR_SAMP(input1)</pre> Since 3.3.0</li>
* <li><pre>STDDEV_POP(input1)</pre> Since 3.3.0</li>
* <li><pre>STDDEV_SAMP(input1)</pre> Since 3.3.0</li>
* <li><pre>COVAR_POP(input1, input2)</pre> Since 3.3.0</li>
* <li><pre>COVAR_SAMP(input1, input2)</pre> Since 3.3.0</li>
* <li><pre>CORR(input1, input2)</pre> Since 3.3.0</li>
* <li><pre>REGR_INTERCEPT(input1, input2)</pre> Since 3.4.0</li>
* <li><pre>REGR_R2(input1, input2)</pre> Since 3.4.0</li>
* <li><pre>REGR_SLOPE(input1, input2)</pre> Since 3.4.0</li>
* <li><pre>REGR_SXY(input1, input2)</pre> Since 3.4.0</li>
* </ol>
*
* @since 3.3.0
*/
@Evolving
public final class GeneralAggregateFunc extends ExpressionWithToString implements AggregateFunc {
private final String name;
private final boolean isDistinct;
private final Expression[] children;
public GeneralAggregateFunc(String name, boolean isDistinct, Expression[] children) {
this.name = name;
this.isDistinct = isDistinct;
this.children = children;
}
public String name() { return name; }
public boolean isDistinct() { return isDistinct; }
@Override
public Expression[] children() { return children; }
}
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