GitHub user AbhiMadav opened a pull request:
https://github.com/apache/spark/pull/15591
[SPARK-17922] [SQL] ClassCastException java.lang.ClassCastException:
org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator
cannot be cast to org.apache.spark.sql.catalyst.expressions.UnsafeProjection
## What changes were proposed in this pull request?
Janino compiler internally creates a byteclassloader
(http://grepcode.com/file/repo1.maven.org/maven2/org.codehaus.janino/janino/2.5.15/org/codehaus/janino/ByteArrayClassLoader.java#ByteArrayClassLoader)
to load the compiled generated class. But this class loader doesnot override
load class to load the class from byte array for the generated class. Instead
the call first goes to parent class loader and if somehow the classloader finds
the old generatedClass( all the generated class names are same) it will
incorrectly load the old generated class. This class loader will be used to
intercept delegation to parent if the class has to be loaded by the current
byte class loader. This will be set as the parent class loader for janino
compiler in CodeGenerator.doCompile.
Special classloader to skip delegating to parent class loader when the
class name is same as the generated class name. Because that class should be
loaded by the current class loader
## How was this patch tested?
manual tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/AbhiMadav/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15591.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15591
----
commit fa5004df3a6a41e8b6835532714ff7fa69933983
Author: Abhishek Madav <abhima...@gmail.com>
Date: 2016-10-21T01:00:06Z
SPARK-17922
ClassCastException java.lang.ClassCastException:
org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator
cannot be cast to
org.apache.spark.sql.catalyst.expressions.UnsafeProjection
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