Re: gen_guc_tables.pl: Validate required GUC fields before code generation

On 2025-Nov-10, Chao Li wrote:

> While working on the other patch and editing guc_parameters.dat, I
> mistakenly deleted a “max” value line, then I got the following error
> during build:

> The error message is unclear and is not helpful to identify the real issue.

Funny -- I made a very similar mistake recently and was also going to
complain about the resulting error message, so +1 for getting it
improved along the lines you proposed, plus Ilmari's suggestions.

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