GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19085
[SPARK-21534][SQL][PySpark] PickleException when creating dataframe from
python row with empty bytearray
## What changes were proposed in this pull request?
`PickleException` is thrown when creating dataframe from python row with
empty bytearray
spark.createDataFrame(spark.sql("select unhex('') as
xx").rdd.map(lambda x: {"abc": x.xx})).show()
net.razorvine.pickle.PickleException: invalid pickle data for
bytearray; expected 1 or 2 args, got 0
at
net.razorvine.pickle.objects.ByteArrayConstructor.construct(ByteArrayConstructor.java
...
`ByteArrayConstructor` doesn't deal with empty byte array pickled by
Python3.
## How was this patch tested?
Added test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21534
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19085.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 #19085
----
commit a362d6be80cb96e9a29b452e3c97a7191a30b55b
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-08-30T08:59:47Z
Add custom ByteArrayConstructor to unpickle empty byte array.
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