Updating changelog and removed useless atom from arrow.

Author: cnuernber

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 # 7.043 
- * Legacy smile -- 2.6.0 -- support was removed.  Support for later smile versions has moved to the scicloj system and operations like PCA are best implemented at this time using neanderthal.
+ * Legacy smile -- 2.6.0 -- support was removed.  Support for later smile versions has moved to the [scicloj system](https://github.com/scicloj/scicloj.ml.smile) and operations like PCA are best implemented at this time using neanderthal.
 
 # 7.042
  * Upgrade hamf to get new api methods - lines and re-matches.

src/tech/v3/libs/arrow.clj

@@ -359,7 +359,6 @@ Dependent block frames are not supported!!")
 ;; Protocol extensions for arrow schema types
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-(defonce type-atom (atom nil))
 
 (extend-protocol clj-proto/Datafiable
   ArrowType$Int
@@ -430,7 +429,7 @@ Dependent block frames are not supported!!")
                   :ordered? (.isOrdered this)
                   :index-type (datafy (.getIndexType this))})
   ArrowType$List
-  (datafy [this] (swap! type-atom conj this)
+  (datafy [this]
     {:datatype :list}))