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From "Xiao Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23271) Parquet output contains only "_SUCCESS" file after empty DataFrame saving
Date Tue, 06 Feb 2018 07:47:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353517#comment-16353517
] 

Xiao Li commented on SPARK-23271:
---------------------------------

For this behavior, I remember [~zsxwing] and I had a discussion a few months ago. However,
I forgot the conclusion we made. : )

> Parquet output contains only "_SUCCESS" file after empty DataFrame saving 
> --------------------------------------------------------------------------
>
>                 Key: SPARK-23271
>                 URL: https://issues.apache.org/jira/browse/SPARK-23271
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Pavlo Z.
>            Priority: Minor
>         Attachments: parquet-empty-output.zip
>
>
> Sophisticated case, reproduced only if read empty CSV file without header with assigned
schema.
> Steps for reproduce (Scala):
> {code:java}
> val anySchema = StructType(StructField("anyName", StringType, nullable = false) :: Nil)
> val inputDF = spark.read.schema(anySchema).csv(inputFolderWithEmptyCSVFile)
> inputDF.write.parquet(outputFolderName)
> // Exception: org.apache.spark.sql.AnalysisException: Unable to infer schema for Parquet.
It must be specified manually.;
> val actualDF = spark.read.parquet(outputFolderName)
>  
> {code}
> *Actual:* Only "_SUCCESS" file in output directory
> *Expected*: at least one Parquet file with schema.
> Project for reproduce is attached.



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