Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> with get_fn_expr_arg_stable() we are able to fix second parameter
> without some performance issues.
No, that will create its own performance issues ---
get_fn_expr_arg_stable isn't especially cheap.
If there were a really strong reason why we had to do it,
then I'd agree, but frankly the argument for disallowing
a variable delimiter is too thin.
regards, tom lane
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