Github user mallman commented on a diff in the pull request: https://github.com/apache/spark/pull/14690#discussion_r82850487 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala --- @@ -225,13 +225,16 @@ case class FileSourceScanExec( } // These metadata values make scan plans uniquely identifiable for equality checking. - override val metadata: Map[String, String] = Map( - "Format" -> relation.fileFormat.toString, - "ReadSchema" -> outputSchema.catalogString, - "Batched" -> supportsBatch.toString, - "PartitionFilters" -> partitionFilters.mkString("[", ", ", "]"), - "PushedFilters" -> dataFilters.mkString("[", ", ", "]"), - "InputPaths" -> relation.location.paths.mkString(", ")) + override val metadata: Map[String, String] = { + def seqToString(seq: Seq[Any]) = seq.mkString("[", ", ", "]") + val location = relation.location + Map("Format" -> relation.fileFormat.toString, + "ReadSchema" -> outputSchema.catalogString, + "Batched" -> supportsBatch.toString, + "PartitionFilters" -> seqToString(partitionFilters), + "PushedFilters" -> seqToString(dataFilters), + "Location" -> (location.getClass.getSimpleName + seqToString(location.rootPaths))) --- End diff -- I'm going to pull this value out to a local `val`. The reason I don't want to make this part of the `BasicFileCatalog` type is that this format seems specific to this class's `metadata` method. For example, we're using the method-local `seqToString` method to format the `rootPaths` list. Regarding the partition count, this is actually a little trickier than I expected. I'm going to expand on that in a standalone PR comment after the next push.
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