Introduce expression initialization hook?

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Introduce expression initialization hook?
Date: 2017-03-17 22:44:44
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It looks we're creeping towards agreement in

It'd be fairly easy to add a hook in its ExecInstantiateExpr(), which'd
allow extensions to provide newer (presumably faster) ways to evaluate

I myself have no use for this, I'm determined to get JITed expression
evaluation into core. But I could see others finding it useful.

Even if the concensus were that we want a hook there, I do not plan to
add it before this is committed, and a few other items are addressed.
But the discussion might take some time, so ...

- Andres

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