spark CodegenFallback 源码
spark CodegenFallback 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodegenFallback.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.codegen
import org.apache.spark.sql.catalyst.expressions.{Expression, LeafExpression, Nondeterministic}
import org.apache.spark.sql.catalyst.expressions.codegen.Block._
/**
* A trait that can be used to provide a fallback mode for expression code generation.
*/
trait CodegenFallback extends Expression {
protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
// LeafNode does not need `input`
val input = if (this.isInstanceOf[LeafExpression]) "null" else ctx.INPUT_ROW
val idx = ctx.references.length
ctx.references += this
var childIndex = idx
this.foreach {
case n: Nondeterministic =>
// This might add the current expression twice, but it won't hurt.
ctx.references += n
childIndex += 1
ctx.addPartitionInitializationStatement(
s"""
|((Nondeterministic) references[$childIndex])
| .initialize(partitionIndex);
""".stripMargin)
case _ =>
}
val objectTerm = ctx.freshName("obj")
val placeHolder = ctx.registerComment(this.toString)
val javaType = CodeGenerator.javaType(this.dataType)
if (nullable) {
ev.copy(code = code"""
$placeHolder
Object $objectTerm = ((Expression) references[$idx]).eval($input);
boolean ${ev.isNull} = $objectTerm == null;
$javaType ${ev.value} = ${CodeGenerator.defaultValue(this.dataType)};
if (!${ev.isNull}) {
${ev.value} = (${CodeGenerator.boxedType(this.dataType)}) $objectTerm;
}""")
} else {
ev.copy(code = code"""
$placeHolder
Object $objectTerm = ((Expression) references[$idx]).eval($input);
$javaType ${ev.value} = (${CodeGenerator.boxedType(this.dataType)}) $objectTerm;
""", isNull = FalseLiteral)
}
}
}
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