From 00ccbefbc7414fed4547d40ee3f5964da13268c6 Mon Sep 17 00:00:00 2001
From: Andrey Antukh <niwi@niwi.be>
Date: Fri, 8 Nov 2013 08:36:53 +0100
Subject: [PATCH] Add postgresql function for access to pickle tags array and
 aggregate it.

---
 sql/tags.sql | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 sql/tags.sql

diff --git a/sql/tags.sql b/sql/tags.sql
new file mode 100644
index 00000000..368d0b28
--- /dev/null
+++ b/sql/tags.sql
@@ -0,0 +1,24 @@
+CREATE OR REPLACE FUNCTION unpickle (data text)
+  RETURNS text[]
+AS $$
+    import base64
+    import pickle
+
+    return pickle.loads(base64.b64decode(data))
+$$ LANGUAGE plpythonu;
+
+CREATE OR REPLACE FUNCTION array_uniq_join (data text[], data2 text[])
+  RETURNS text[]
+AS $$
+    tmp = set(data)
+    tmp.update(data2)
+    return tuple(tmp)
+$$ LANGUAGE plpythonu;
+
+DROP AGGREGATE array_uniq_concat (text[]);
+CREATE AGGREGATE array_uniq_concat (text[])
+(
+    sfunc = array_uniq_join,
+    stype = text[],
+    initcond = '{}'
+);