MCOL-2180 Update UDAF docs

utils/udfsdk/docs/source/changelog.rst

@@ -5,5 +5,6 @@ Version History
 | Version | Date       | Changes                     |
 +=========+============+=============================+
 | 1.1.0α  | 2017-08-25 | - First alpha release       |
++---------+------------+-----------------------------+
 | 1.2.0α  | 2016-05-18 | - Add multi parm support    |
 +---------+------------+-----------------------------+

utils/udfsdk/docs/source/conf.py

@@ -49,7 +49,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'UDAF'
-copyright = u'2017, MariaDB Corporation'
+copyright = u'2019, MariaDB Corporation'
 author = u'MariaDB Corporation'
 
 # The version info for the project you're documenting, acts as replacement for
@@ -57,9 +57,9 @@ author = u'MariaDB Corporation'
 # built documents.
 #
 # The short X.Y version.
-version = u'1.1'
+version = u'1.2'
 # The full version, including alpha/beta/rc tags.
-release = u'1.1'
+release = u'1.2'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

utils/udfsdk/docs/source/reference/UDAFMap.rst

@@ -34,3 +34,24 @@ The UDAFMap is where we tell the system about our function. For Columnstore 1.2,
     return fm;
  }
 
+An alternative method added for 1.2 is to put the following in your .cpp file.
+replace "median" with the name of your function:
+
+::
+
+ class Add_median_ToUDAFMap
+ {
+ public:
+     Add_median_ToUDAFMap()
+     {
+         UDAFMap::getMap()["median"] = new median();
+     }
+ };
+
+ static Add_median_ToUDAFMap addToMap;
+
+This defines an object whose constructor adds the entry to the UDAFMap. The 
+static declaration instatiates an object at runtime, thus adding the entry
+at startup. 
+
+