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PL/Sample is an example template of procedural-language handler. This
can be used as a base to implement a custom PL, or as a facility to test
APIs dedicated to PLs. Much more could be done in this module, like
adding a simple validator, but this is left as future work.
The documentation included originally some C code to understand the
basics of PL handler implementation, but it was outdated, and not really
helpful either if trying to implement a new procedural language,
particularly when it came to the integration of a PL installation with
CREATE EXTENSION.
Author: Mark Wong
Reviewed-by: Tom Lane, Michael Paquier
Discussion: https://postgr.es/m/20200612172648.GA3327@2ndQuadrant.com
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