[jira] [Resolved] (SPARK-25371) Vector Assembler with no input columns leads to opaque error

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-25371.
---------------------------------
       Resolution: Fixed
         Assignee: Marco Gaido
    Fix Version/s: 2.4.0
                   2.3.2

> Vector Assembler with no input columns leads to opaque error
> ------------------------------------------------------------
>
>                 Key: SPARK-25371
>                 URL: https://issues.apache.org/jira/browse/SPARK-25371
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, MLlib
>    Affects Versions: 2.3.0, 2.3.1
>            Reporter: Victor Alor
>            Assignee: Marco Gaido
>            Priority: Trivial
>             Fix For: 2.3.2, 2.4.0
>
>
> When `VectorAssembler ` is given an empty array as its inputColumns it throws an opaque error. In versions less than 2.3 `VectorAssembler` it simply appends a column containing empty vectors. 
>  
> {code:java}
> val inputCols = Array()
> val outputCols = Array("A")
> val vectorAssembler = new VectorAssembler()
> .setInputCols(inputCols)
> .setOutputCol(outputCols)
> vectorAssmbler.fit(data).transform(df)
> {code}
> In versions 2.3 > this throws the exception below
> {code:java}
> org.apache.spark.sql.AnalysisException: cannot resolve 'named_struct()' due to data type mismatch: input to function named_struct requires at least one argument;;
> {code}
> Whereas in versions less than 2.3 it just adds a column containing an empty vector.
> I'm not certain if this is an intentional choice or an actual bug. If this is a bug, the `VectorAssembler` should be modified to append an empty vector column if it detects no inputCols.
>  
> If it is a design decision it would be nice to throw a human readable exception explicitly stating inputColumns must not be empty. The current error is somewhat opaque.



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