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-rw-r--r--src/clojure_sql/dsl.clj3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/clojure_sql/dsl.clj b/src/clojure_sql/dsl.clj
index 0a05763..5eae2d7 100644
--- a/src/clojure_sql/dsl.clj
+++ b/src/clojure_sql/dsl.clj
@@ -379,7 +379,8 @@
(assoc query :drop n))))
(defn ^:private union-compatible? [& queries]
- (apply = (map (comp set keys :fields) queries)))
+ (and (every? (comp seq keys :fields) queries)
+ (apply = (map (comp set keys :fields) queries))))
(defn union
"Combine the results of two queries"