SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function groupArraySample (children 2)
     ExpressionList (children 1)
      Literal \'x\'
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'0\'
        Literal \'UInt64\'
      Literal UInt64_123
