fix #375

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changes
 
 * 2.1.next in progress
+  * Fix #375 for `:nest` statement.
   * Update test dependencies.
   * Update `build-clj` to v0.6.1.
 

doc/special-syntax.md

@@ -201,6 +201,12 @@ level of parentheses around it:
 
 `:nest` is also supported as a SQL clause for the same reason.
 
+```clojure
+;; BigQuery requires UNION clauses be parenthesized:
+(sql/format {:union-all [{:nest {:select :*}} {:nest {:select :*}}]})
+;;=> ["(SELECT *) UNION ALL (SELECT *)"]
+```
+
 ## not
 
 Accepts a single expression and formats it with `NOT`

src/honey/sql.cljc

@@ -875,8 +875,8 @@
          :refresh-materialized-view (fn [_ x] (format-create :refresh :materialized-view x nil))
          :raw             (fn [_ x] (raw-render x))
          :nest            (fn [_ x]
-                            (let [[sql & params] (format-expr x)]
+                            (let [[sql & params] (format-dsl x {:nested true})]
-                              (into [(str "(" sql ")")] params)))
+                              (into [sql] params)))
          :with            #'format-with
          :with-recursive  #'format-with
          :intersect       #'format-on-set-op