spark AlwaysFalse 源码
spark AlwaysFalse 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/filter/AlwaysFalse.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.filter;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.expressions.Literal;
import org.apache.spark.sql.types.DataType;
import org.apache.spark.sql.types.DataTypes;
/**
* A predicate that always evaluates to {@code false}.
*
* @since 3.3.0
*/
@Evolving
public final class AlwaysFalse extends Predicate implements Literal<Boolean> {
public AlwaysFalse() {
super("ALWAYS_FALSE", new Predicate[]{});
}
@Override
public Boolean value() {
return false;
}
@Override
public DataType dataType() {
return DataTypes.BooleanType;
}
@Override
public String toString() { return "FALSE"; }
}
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