Github user srowen commented on a diff in the pull request:
    --- Diff: 
    @@ -197,10 +197,13 @@ case class DataSource(
           val fileCatalog = new ListingFileCatalog(sparkSession, globbedPaths, 
options, None)
    +      val partitionCols = 
    -        fileCatalog.allFiles())
    +        fileCatalog.allFiles()).map { inferredSchema =>
    --- End diff --
    The wrapping threw me off for a minute. You might consider introducing an 
extra variable for the result of inferSchema. Also does 
`.map(partitionCols.foldLeft(_)((struct, field) => struct.add(field)))` work?

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