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List:       postgresql-general
Subject:    Re: Why is my function inlined only when STABLE?
From:       Philip Semanchuk <philip () americanefficient ! com>
Date:       2022-03-29 18:43:27
Message-ID: F391D389-A6C7-41B7-9A53-260632CBDC7B () americanefficient ! com
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> On Mar 29, 2022, at 2:24 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> 
> Philip Semanchuk <philip@americanefficient.com> writes:
> > I have a function that isn't being inlined, and I would appreciate help to \
> > understand why that's the case. 
> 
> I think the test methodology you used is faulty, because it does not
> distinguish between "inline-able" and "foldable to a constant".
> Given an immutable function applied to constant(s), the planner prefers
> to fold to a constant by just executing the function.  The inline-ing
> transformation is considered only when that case doesn't apply.

Excellent point, thank you. Now I understand. I was trying to write an inlining demo \
for my colleagues, and I simplified my example one step too far by using a constant.

I really appreciate the help!

Cheers
Philip


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