Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21106#discussion_r187986602
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CodeGeneratorWithInterpretedFallback.scala
---
@@ -0,0 +1,80 @@
+/*
+ * 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.codehaus.commons.compiler.CompileException
+import org.codehaus.janino.InternalCompilerException
+
+import org.apache.spark.TaskContext
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.util.Utils
+
+/**
+ * Catches compile error during code generation.
+ */
+object CodegenError {
+ def unapply(throwable: Throwable): Option[Exception] = throwable match {
+ case e: InternalCompilerException => Some(e)
+ case e: CompileException => Some(e)
+ case _ => None
+ }
+}
+
+/**
+ * Defines values for `SQLConf` config of fallback mode. Use for test only.
+ */
+object CodegenObjectFactoryMode extends Enumeration {
+ val AUTO, CODEGEN_ONLY, NO_CODEGEN = Value
+
+ def currentMode: CodegenObjectFactoryMode.Value = {
+ // If we weren't on task execution, accesses that config.
+ if (TaskContext.get == null) {
+ val config = SQLConf.get.getConf(SQLConf.CODEGEN_FACTORY_MODE)
+ CodegenObjectFactoryMode.withName(config)
+ } else {
+ CodegenObjectFactoryMode.AUTO
+ }
+ }
+}
+
+/**
+ * A codegen object generator which creates objects with codegen path
first. Once any compile
+ * error happens, it can fallbacks to interpreted implementation. In
tests, we can use a SQL config
+ * `SQLConf.CODEGEN_FACTORY_MODE` to control fallback behavior.
+ */
+abstract class CodeGeneratorWithInterpretedFallback[IN, OUT] {
+
+ def createObject(in: IN): OUT = {
+ // We are allowed to choose codegen-only or no-codegen modes if under
tests.
+ if (Utils.isTesting && CodegenObjectFactoryMode.currentMode !=
CodegenObjectFactoryMode.AUTO) {
--- End diff --
now it's better to call it fallback mode?
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