SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Literal UInt64_1 (alias x)
    Function roundDown (children 1)
     ExpressionList (children 2)
      Identifier x
      Function emptyArrayUInt8 (children 1)
       ExpressionList