From 7fac5651f67822e363c18e9ced24858056aacb9b Mon Sep 17 00:00:00 2001
From: taylorchu <tailinchu@gmail.com>
Date: Tue, 15 Oct 2019 16:08:12 -0700
Subject: [PATCH] BUGFIX: don't auto add parentheses for union (#192)

---
 interpolate_test.go | 4 +++-
 union.go            | 6 ++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/interpolate_test.go b/interpolate_test.go
index 7a71a0d6..bb45aedd 100644
--- a/interpolate_test.go
+++ b/interpolate_test.go
@@ -124,7 +124,9 @@ func TestInterpolateForDialect(t *testing.T) {
 					Select("b").From("table2"),
 				).As("t"),
 			},
-			want: "((SELECT a FROM table1) UNION ALL (SELECT b FROM table2)) AS `t`",
+			// parentheses around union subqueries are not supported in sqlite
+			// but supported in both mysql and postgres.
+			want: "(SELECT a FROM table1 UNION ALL SELECT b FROM table2) AS `t`",
 		},
 		{
 			query: "?",
diff --git a/union.go b/union.go
index d0b2f8bb..453946b7 100644
--- a/union.go
+++ b/union.go
@@ -34,8 +34,10 @@ func (u *union) Build(d Dialect, buf Buffer) error {
 				buf.WriteString("ALL ")
 			}
 		}
-		buf.WriteString(placeholder)
-		buf.WriteValue(b)
+		err := b.Build(d, buf)
+		if err != nil {
+			return err
+		}
 	}
 	return nil
 }