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

    https://github.com/apache/spark/pull/5014#discussion_r26408121
  
    --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala ---
    @@ -557,8 +557,11 @@ 
https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C
                 "TOK_TABLEPROPERTIES"),
               children)
           val (db, tableName) = extractDbNameTableName(tableNameParts)
    -
    -      CreateTableAsSelect(db, tableName, nodeToPlan(query), allowExisting 
!= None, Some(node))
    +      if (ignores.exists(_ != None)) {
    +        CreateTableAsSelect(db, tableName, nodeToPlan(query), 
allowExisting != None, Some(node))
    --- End diff --
    
    In `CreateTables`, the `node` is parsed by Hive's codes and see if file 
format or storage handler is given. If no, and `hive.convertCTAS` is true, Hive 
CTAS statement will become a data source table with default data source, too.


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