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-rw-r--r--lib/gitlab/sql/union.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/gitlab/sql/union.rb b/lib/gitlab/sql/union.rb
index f05592fc3a3..4c9e0cd5cdf 100644
--- a/lib/gitlab/sql/union.rb
+++ b/lib/gitlab/sql/union.rb
@@ -29,7 +29,7 @@ module Gitlab
end
if fragments.any?
- fragments.join("\n#{union_keyword}\n")
+ fragments.join(")\n#{union_keyword}\n(").prepend('(').concat(')')
else
'NULL'
end