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

    https://github.com/apache/spark/pull/11846#discussion_r57409753
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ---
    @@ -634,24 +641,26 @@ class Analyzer(
         }
       }
     
    -  /**
    -   * In many dialects of SQL it is valid to sort by attributes that are 
not present in the SELECT
    -   * clause.  This rule detects such queries and adds the required 
attributes to the original
    -   * projection, so that they will be available during sorting. Another 
projection is added to
    -   * remove these attributes after sorting.
    -   *
    -   * This rule also resolves the position number in sort references. This 
support is introduced
    -   * in Spark 2.0. Before Spark 2.0, the integers in Order By has no 
effect on output sorting.
    -   * - When the sort references are not integer but foldable expressions, 
ignore them.
    -   * - When spark.sql.orderByOrdinal is set to false, ignore the position 
numbers too.
    -   */
    -  object ResolveSortReferences extends Rule[LogicalPlan] {
    + /**
    +  * In many dialects of SQL it is valid to use ordinal positions in 
order/sort by and group by
    +  * clauses. This rule is to convert ordinal positions to the 
corresponding expressions in the
    +  * select list. This support is introduced in Spark 2.0.
    +  *
    +  * - When the sort references or group by expressions are not integer but 
foldable expressions,
    +  * just ignore them.
    +  * - When spark.sql.orderByOrdinal/spark.sql.groupByOrdinal is set to 
false, ignore the position
    +  * numbers too.
    +  *
    +  * Before the release of Spark 2.0, the literals in order/sort by and 
group by clauses
    +  * have no effect on the results.
    +  */
    +  object ResolveOrdinalInOrderByAndGroupBy extends Rule[LogicalPlan] {
         def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
    -      case s: Sort if !s.child.resolved => s
    -      // Replace the index with the related attribute for ORDER BY
    +      // Replace the index with the related attribute for ORDER BY,
           // which is a 1-base position of the projection list.
           case s @ Sort(orders, global, child)
    -          if conf.orderByOrdinal && orders.exists(o => 
IntegerIndex.unapply(o.child).nonEmpty) =>
    +          if conf.orderByOrdinal && child.resolved &&
    --- End diff --
    
    We can add a `case plan if !plan.childrenResolved => plan` at the beginning.


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