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

    https://github.com/apache/spark/pull/15099#discussion_r79150232
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala
 ---
    @@ -140,7 +146,9 @@ case class CreateDataSourceTableAsSelectCommand(
     
         var createMetastoreTable = false
         var existingSchema = Option.empty[StructType]
    -    if (sparkSession.sessionState.catalog.tableExists(table.identifier)) {
    +    // Pass a table identifier with database part, so that `tableExists` 
won't check temp views
    +    // unexpectedly.
    +    if (sparkSession.sessionState.catalog.tableExists(tableIdentWithDB)) {
    --- End diff --
    
    I have, in my previous refactor PR: 
https://github.com/apache/spark/pull/14962
    
    This PR aims to just fix these bugs surgically, so that it's easy to 
backport to 2.0


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