DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 1)
      ExpressionList (children 3)
       Literal UInt64_1
       Literal \'test\'
       Literal Array_[UInt64_1, UInt64_2, UInt64_3]