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https://issues.apache.org/jira/browse/SPARK-18667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822631#comment-15822631
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Liang-Chi Hsieh commented on SPARK-18667:
-----------------------------------------
[~someonehere15],
Yeah, I can reproduce that the last line {{df3.selectExpr('file as FILE','x AS
COL1','sameText(y) AS COL2').show()}} costs more time to run. At the first
look, I think they are different problems. I will take a look too. Thank you.
> 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
> Assignee: Liang-Chi Hsieh
> Fix For: 2.1.0
>
>
> {{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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