SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function caseWithExpression (children 1)
     ExpressionList (children 4)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'1\'
        Literal \'Nullable(Int32)\'
      Literal UInt64_1
      Literal UInt64_123
      Literal UInt64_0
