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

    https://github.com/apache/spark/pull/14191#discussion_r70754137
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
 ---
    @@ -159,7 +159,9 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef] 
with Logging {
           // Add organization statements.
           optionalMap(ctx.queryOrganization)(withQueryResultClauses).
           // Add insert.
    -      optionalMap(ctx.insertInto())(withInsertInto)
    --- End diff --
    
    This allows for the following syntax:
    ```sql
    INSERT INTO tbl_a
    SELECT *
    INTO tbl_a
    FROM tbl_b
    ```
    Make sure that we cannot have both.


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