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https://issues.apache.org/jira/browse/SPARK-18667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714200#comment-15714200
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Apache Spark commented on SPARK-18667:
--------------------------------------

User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/16115

> input_file_name function does not work with UDF
> -----------------------------------------------
>
>                 Key: SPARK-18667
>                 URL: https://issues.apache.org/jira/browse/SPARK-18667
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>            Reporter: Hyukjin Kwon
>
> {{input_file_name()}} does not return the file name but empty string instead 
> when it is used as input for UDF in PySpark as below: 
> with the data as below:
> {code}
> {"a": 1}
> {code}
> with the codes below:
> {code}
> from pyspark.sql.functions import *
> from pyspark.sql.types import *
> def filename(path):
>     return path
> sourceFile = udf(filename, StringType())
> spark.read.json("tmp.json").select(sourceFile(input_file_name())).show()
> {code}
> prints as below:
> {code}
> +---------------------------+
> |filename(input_file_name())|
> +---------------------------+
> |                           |
> +---------------------------+
> {code}
> but the codes below:
> {code}
> spark.read.json("tmp.json").select(input_file_name()).show()
> {code}
> prints correctly as below:
> {code}
> +--------------------+
> |   input_file_name()|
> +--------------------+
> |file:///Users/hyu...|
> +--------------------+
> {code}
> This seems PySpark specific issue.



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