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

    https://github.com/apache/spark/pull/10723#discussion_r49974415
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala ---
    @@ -52,26 +57,30 @@ private[sql] class SparkQl(conf: ParserConf = 
SimpleParserConf()) extends Cataly
               nodeToDescribeFallback(node)
             } else {
               tableType match {
    -            case Token("TOK_TABTYPE", Token("TOK_TABNAME", nameParts :: 
Nil) :: Nil) =>
    +            case Token("TOK_TABTYPE", Token("TOK_TABNAME", nameParts) :: 
Nil) =>
    --- End diff --
    
    if we parse the following SQL using the parse driver 
```org.apache.spark.sql.catalyst.parser.ParseDriver.parsePlan("DESCRIBE 
EXTENDED tbl.a", null)```
    
    We would end up with the following AST:
    
        TOK_DESCTABLE 1, 0, 6, 18
        :- TOK_TABTYPE 1, 4, 6, 18 
        :  +- TOK_TABNAME 1, 4, 6, 18 
        :     :- tbl 1, 4, 4, 18 
        :     +- a 1, 6, 6, 22 
        +- EXTENDED 1, 2, 2, 9 
    
    This change would pick this up, and old code didn't (I am sure I tested 
this though :S ). You can disable this in the DDL parser, to see if it works 
now.


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