spark ApplyFunctionExpression 源码
spark ApplyFunctionExpression 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ApplyFunctionExpression.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.expressions
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
import org.apache.spark.sql.connector.catalog.functions.ScalarFunction
import org.apache.spark.sql.types.{AbstractDataType, DataType}
case class ApplyFunctionExpression(
function: ScalarFunction[_],
children: Seq[Expression])
extends Expression with UserDefinedExpression with CodegenFallback with ImplicitCastInputTypes {
override def nullable: Boolean = function.isResultNullable
override def name: String = function.name()
override def dataType: DataType = function.resultType()
override def inputTypes: Seq[AbstractDataType] = function.inputTypes().toSeq
override lazy val deterministic: Boolean = function.isDeterministic &&
children.forall(_.deterministic)
private lazy val reusedRow = new SpecificInternalRow(function.inputTypes())
/** Returns the result of evaluating this expression on a given input Row */
override def eval(input: InternalRow): Any = {
var i = 0
while (i < children.length) {
val expr = children(i)
reusedRow.update(i, expr.eval(input))
i += 1
}
function.produceResult(reusedRow)
}
override protected def withNewChildrenInternal(newChildren: IndexedSeq[Expression]): Expression =
copy(children = newChildren)
}
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