Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18907#discussion_r132515441 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala --- @@ -412,6 +412,11 @@ case class CatalogRelation( assert(tableMeta.partitionSchema.sameType(partitionCols.toStructType)) assert(tableMeta.dataSchema.sameType(dataCols.toStructType)) + // If table schema is empty, Spark will infer the schema at runtime, so we should mark this + // relation as unresolved and wait it to be replaced by relation with actual schema, before + // resolving parent plans. + override lazy val resolved: Boolean = tableMeta.schema.nonEmpty --- End diff -- I think the schema is generated by their programs. That is why it contains zero column.
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