spark FunctionExpressionBuilder 源码
spark FunctionExpressionBuilder 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/FunctionExpressionBuilder.scala
/*
* 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.catalyst.catalog
import org.apache.spark.sql.catalyst.expressions.Expression
// A builder to create `Expression` from function information.
trait FunctionExpressionBuilder {
def makeExpression(name: String, clazz: Class[_], input: Seq[Expression]): Expression
}
object DummyFunctionExpressionBuilder extends FunctionExpressionBuilder {
override def makeExpression(name: String, clazz: Class[_], input: Seq[Expression]): Expression = {
throw new UnsupportedOperationException
}
}
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