joins on dataset with not typical names

[genmeblog]

When column name is not string, keyword or symbol, joins fail.

(def DS (ds/->dataset [{:a 11 [:a :b] 2}]))

DS
;; => _unnamed [1 2]:
;;    | :a | [:a :b] |
;;    |----|---------|
;;    | 11 |       2 |

(def join-res (ds/left-join :a DS DS))

(ds/column-names join-res)
;; => (:a nil :right.a nil)

(meta join-res)
;; => {:name "left-outer-join",
;;     :left-column-names {:a :a, [:a :b] nil},
;;     :right-column-names {:a :right.a, [:a :b] nil}}