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https://issues.apache.org/jira/browse/SPARK-25371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608443#comment-16608443
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Apache Spark commented on SPARK-25371:
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User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/22373
> 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
> Priority: Trivial
>
> 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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