Waiting for 9.5 – Add transforms feature

On 26th of April, Peter Eisentraut committed patch:

Add transforms feature
 
This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.
 
reviews by Pavel Stěhule and Andres Freund

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