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https://issues.apache.org/jira/browse/SPARK-9131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652694#comment-14652694
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Davies Liu commented on SPARK-9131:
-----------------------------------
I think this maybe fixed by https://github.com/apache/spark/pull/7131
[~luispeguerra] Could you help to confirm that its' fixed in master or not?
> Python UDFs change data values
> ------------------------------
>
> Key: SPARK-9131
> URL: https://issues.apache.org/jira/browse/SPARK-9131
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 1.4.0, 1.4.1
> Environment: Pyspark 1.4 and 1.4.1
> Reporter: Luis Guerra
> Assignee: Davies Liu
> Priority: Blocker
> Attachments: testjson_jira9131.z01, testjson_jira9131.z02,
> testjson_jira9131.z03, testjson_jira9131.z04, testjson_jira9131.z05,
> testjson_jira9131.z06, testjson_jira9131.zip
>
>
> I am having some troubles when using a custom udf in dataframes with pyspark
> 1.4.
> I have rewritten the udf to simplify the problem and it gets even weirder.
> The udfs I am using do absolutely nothing, they just receive some value and
> output the same value with the same format.
> I show you my code below:
> {code}
> c= a.join(b, a['ID'] == b['ID_new'], 'inner')
> c.filter(c['ID'] == '6000000002698917').show()
> udf_A = UserDefinedFunction(lambda x: x, DateType())
> udf_B = UserDefinedFunction(lambda x: x, DateType())
> udf_C = UserDefinedFunction(lambda x: x, DateType())
> d = c.select(c['ID'], c['t1'].alias('ta'),
> udf_A(vinc_muestra['t2']).alias('tb'), udf_B(vinc_muestra['t1']).alias('tc'),
> udf_C(vinc_muestra['t2']).alias('td'))
> d.filter(d['ID'] == '6000000002698917').show()
> {code}
> I am showing here the results from the outputs:
> {code}
> +----------------+----------------+----------+----------+
> | ID | ID_new | t1 | t2 |
> +----------------+----------------+----------+----------+
> |6000000002698917| 6000000002698917| 2012-02-28| 2014-02-28|
> |6000000002698917| 6000000002698917| 2012-02-20| 2013-02-20|
> |6000000002698917| 6000000002698917| 2012-02-28| 2014-02-28|
> |6000000002698917| 6000000002698917| 2012-02-20| 2013-02-20|
> |6000000002698917| 6000000002698917| 2012-02-20| 2013-02-20|
> |6000000002698917| 6000000002698917| 2012-02-28| 2014-02-28|
> |6000000002698917| 6000000002698917| 2012-02-28| 2014-02-28|
> |6000000002698917| 6000000002698917| 2012-02-20| 2013-02-20|
> +----------------+----------------+----------+----------+
> +----------------+---------------+---------------+------------+------------+
> | ID | ta | tb | tc | td
> |
> +----------------+---------------+---------------+------------+------------+
> |6000000002698917| 2012-02-28| 2007-03-05| 2003-03-05|
> 2014-02-28|
> |6000000002698917| 2012-02-20| 2007-02-15| 2002-02-15|
> 2013-02-20|
> |6000000002698917| 2012-02-28| 2007-03-10| 2005-03-10|
> 2014-02-28|
> |6000000002698917| 2012-02-20| 2007-03-05| 2003-03-05|
> 2013-02-20|
> |6000000002698917| 2012-02-20| 2013-08-02| 2013-01-02|
> 2013-02-20|
> |6000000002698917| 2012-02-28| 2007-02-15| 2002-02-15|
> 2014-02-28|
> |6000000002698917| 2012-02-28| 2007-02-15| 2002-02-15|
> 2014-02-28|
> |6000000002698917| 2012-02-20| 2014-01-02| 2013-01-02|
> 2013-02-20|
> +----------------+---------------+---------------+------------+------------+
> {code}
> The problem here is that values at columns 'tb', 'tc' and 'td' in dataframe
> 'd' are completely different from values 't1' and 't2' in dataframe c even
> when my udfs are doing nothing. It seems like if values were somehow got from
> other registers (or just invented). Results are different between executions
> (apparently random).
> Thanks in advance
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