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List:       postgresql-general
Subject:    Re: Mapping view columns to their source columns
From:       Tom Lane <tgl () sss ! pgh ! pa ! us>
Date:       2019-09-25 14:39:18
Message-ID: 23237.1569422358 () sss ! pgh ! pa ! us
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Matt Andrews <mattandrews@massey.com.au> writes:
> Incidentally, I have become interested in the pg_node_tree type. I can't
> find much info on it. Would that be in the source? What would be the first
> steps for writing an extension for this sort of thing?

pg_node_tree is just a serialization of the tree-of-Node-structs
representation used inside the server.  See
src/include/nodes/primnodes.h and adjacent files for Node definitions.
The actual serialization code is in src/backend/nodes/outfuncs.c
and adjacent files.

(Beware, however, that there's proposals floating around to change
the serialization format.)

			regards, tom lane


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