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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2014/12/16 23:38:16 UTC
[jira] [Resolved] (SPARK-4812) SparkPlan.codegenEnabled may be
initialized to a wrong value
[ https://issues.apache.org/jira/browse/SPARK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Armbrust resolved SPARK-4812.
-------------------------------------
Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 3660
[https://github.com/apache/spark/pull/3660]
> SparkPlan.codegenEnabled may be initialized to a wrong value
> ------------------------------------------------------------
>
> Key: SPARK-4812
> URL: https://issues.apache.org/jira/browse/SPARK-4812
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Fix For: 1.3.0
>
>
> The problem is `codegenEnabled` is `val`, but it uses a `val` `sqlContext`, which can be override by subclasses. Here is a simple example to show this issue.
> {code}
> scala> :paste
> // Entering paste mode (ctrl-D to finish)
> abstract class Foo {
> protected val sqlContext = "Foo"
> val codegenEnabled: Boolean = {
> println(sqlContext) // it will call subclass's `sqlContext` which has not yet been initialized.
> if (sqlContext != null) {
> true
> } else {
> false
> }
> }
> }
> class Bar extends Foo {
> override val sqlContext = "Bar"
> }
> println(new Bar().codegenEnabled)
> // Exiting paste mode, now interpreting.
> null
> false
> defined class Foo
> defined class Bar
> scala>
> {code}
> We should make `sqlContext` `final` to prevent subclasses from overriding it incorrectly.
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