DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 1)
      ExpressionList (children 4)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_2
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_2
       Subquery (alias a) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_3
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_3
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_4
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_4