DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 1)
      ExpressionList (children 2)
       Subquery (alias c) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 2)
            Literal UInt64_1 (alias a)
            Literal UInt64_2 (alias b)
          SelectQuery (children 1)
           ExpressionList (children 2)
            Literal UInt64_1
            Literal UInt64_2
       QualifiedAsterisk (children 1)
        Identifier c