SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function groupArraySample (children 2)
     ExpressionList (children 1)
      Literal UInt64_1
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'0\'
        Literal \'Int64\'
      Literal UInt64_123
