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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2016/12/01 07:01:06 UTC
[jira] [Created] (SPARK-18667) input_file_name function does not
work with UDF
Hyukjin Kwon created SPARK-18667:
------------------------------------
Summary: 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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