SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function xxHash64 (children 1)
       ExpressionList (children 1)
        Literal \'foo\'
      Function toUInt64 (children 1)
       ExpressionList (children 1)
        Literal UInt64_3728699739546630719