From 9036377148afb61a492c04baf3d82c2c63175bb4 Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@clearboxsystems.com.au>
Date: Mon, 1 Jul 2013 09:54:56 +1000
Subject: Change the condition for union compatible (require projections first)

---
 src/clojure_sql/dsl.clj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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"
-- 
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