SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayConcat (children 1)
     ExpressionList (children 4)
      Literal Array_[UInt64_1, UInt64_2]
      Literal Array_[Int64_-1, Int64_-2]
      Literal Array_[Float64_0.3, Float64_0.7]
      Literal Array_[NULL]
