Add cdb_extension_reload() utility function

Makefile

@@ -9,6 +9,7 @@ CDBSCRIPTS = \
   scripts-available/CDB_SearchPath.sql \
   scripts-available/CDB_DDLTriggers.sql \
   scripts-available/CDB_ExtensionPost.sql \
+  scripts-available/CDB_ExtensionUtils.sql \
   $(END)
 
 UPGRADABLE = \

NEWS

@@ -13,6 +13,10 @@ Enhancements:
 
  - Include revision info in cdb_version() output (#34)
 
+New features:
+
+ - Add a cdb_extension_reload() function
+
 
 0.1.0 - 2014-05-23
 ------------------

README.md

@@ -95,3 +95,9 @@ to "V". Example to upgrade a 0.2.0dev version:
 ALTER EXTENSION cartodb UPDATE TO '0.2.0devnext';
 ALTER EXTENSION cartodb UPDATE TO '0.2.0dev';
 ```
+
+Starting with 0.2.0, the in-place reload can be done with an ad-hoc function:
+
+```sql
+SELECT cartodb.cdb_extension_reload();
+```

scripts-available/CDB_ExtensionUtils.sql

@@ -0,0 +1,13 @@
+CREATE OR REPLACE FUNCTION cartodb.cdb_extension_reload() RETURNS void
+AS $$
+DECLARE
+  ver TEXT;
+  sql TEXT;
+BEGIN
+  ver := split_part(cartodb.cdb_version(), ' ', 1);
+  sql := 'ALTER EXTENSION cartodb UPDATE TO ''' || ver || 'next''';
+  EXECUTE sql;
+  sql := 'ALTER EXTENSION cartodb UPDATE TO ''' || ver || '''';
+  EXECUTE sql;
+END;
+$$ language 'plpgsql' VOLATILE;