Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
    @@ -412,6 +412,11 @@ case class CatalogRelation(
    +  // 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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