maropu commented on issue #23635: [SPARK-26709][SQL] OptimizeMetadataOnlyQuery does not handle empty records correctly URL: https://github.com/apache/spark/pull/23635#issuecomment-457141942 How about simply checking #files > 1 in `PartitionedRelation`? ``` object PartitionedRelation extends PredicateHelper { def unapply(plan: LogicalPlan): Option[(AttributeSet, LogicalPlan)] = { plan match { case l @ LogicalRelation(fsRelation: HadoopFsRelation, _, _, _) if fsRelation.partitionSchema.nonEmpty && fsRelation.location.inputFiles.length > 1 => val partAttrs = AttributeSet(getPartitionAttrs(fsRelation.partitionSchema.map(_.name), l)) Some((partAttrs, l)) ... ```
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