Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18907#discussion_r132514087
  
    --- 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 --
    
    do we? it definitely will.


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