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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4812) SparkPlan.codegenEnabled may be initialized to a wrong value
Date Wed, 10 Dec 2014 07:33:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14240765#comment-14240765
] 

Apache Spark commented on SPARK-4812:
-------------------------------------

User 'zsxwing' has created a pull request for this issue:
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
>
> 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}
> To fix it, we should mark `codegenEnabled` as `lazy`.



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