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https://issues.apache.org/jira/browse/SPARK-20706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276948#comment-16276948
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Apache Spark commented on SPARK-20706:
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User 'mpetruska' has created a pull request for this issue:
https://github.com/apache/spark/pull/19879
> Spark-shell not overriding method/variable definition
> -----------------------------------------------------
>
> Key: SPARK-20706
> URL: https://issues.apache.org/jira/browse/SPARK-20706
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell
> Affects Versions: 2.0.0, 2.1.1, 2.2.0
> Environment: Linux, Scala 2.11.8
> Reporter: Raphael Roth
> Attachments: screenshot-1.png
>
>
> !screenshot-1.png!In the following example, the definition of myMethod is not
> correctly updated:
> ------------------------------
> def myMethod() = "first definition"
> val tmp = myMethod(); val out = tmp
> println(out) // prints "first definition"
> def myMethod() = "second definition" // override above myMethod
> val tmp = myMethod(); val out = tmp
> println(out) // should be "second definition" but is "first definition"
> ------------------------------
> I'm using semicolon to force two statements to be compiled at the same time.
> It's also possible to reproduce the behavior using :paste
> So if I-redefine myMethod, the implementation seems not to be updated in this
> case. I figured out that the second-last statement (val out = tmp) causes
> this behavior, if this is moved in a separate block, the code works just fine.
> EDIT:
> The same behavior can be seen when declaring variables :
> ------------------------------
> val a = 1
> val b = a; val c = b;
> println(b) // prints "1"
> val a = 2 // override a
> val b = a; val c = b;
> println(b) // prints "1" instead of "2"
> ------------------------------
> Interestingly, if the second-last line "val b = a; val c = b;" is executed
> twice, then I get the expected result
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