Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16460#discussion_r94533881
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
 ---
    @@ -473,22 +473,26 @@ case class DataSource(
                   s"Unable to resolve $name given 
[${plan.output.map(_.name).mkString(", ")}]")
               }.asInstanceOf[Attribute]
             }
    +        val fileIndex = catalogTable.map(_.identifier).map { tableIdent =>
    +          sparkSession.table(tableIdent).queryExecution.analyzed.collect {
    +            case LogicalRelation(t: HadoopFsRelation, _, _) => t.location
    +          }.head
    +        }
             // For partitioned relation r, r.schema's column ordering can be 
different from the column
             // ordering of data.logicalPlan (partition columns are all moved 
after data column).  This
             // will be adjusted within InsertIntoHadoopFsRelation.
             val plan =
               InsertIntoHadoopFsRelationCommand(
                 outputPath = outputPath,
                 staticPartitions = Map.empty,
    -            customPartitionLocations = Map.empty,
                 partitionColumns = columns,
                 bucketSpec = bucketSpec,
                 fileFormat = format,
    -            refreshFunction = _ => Unit, // No existing table needs to be 
refreshed.
    --- End diff --
    
    Previously, in this case, we do not call `refreshPartitionsCallback`. After 
this PR, we always refresh it. Is my understanding right?
    
    How did it work without this PR changes? Does that mean we just rely on 
Hive to implicitly call `AlterTableAddPartitionCommand`/`createPartition` when 
the existing table does not exist? 


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