Re: Export log_line_prefix(); useful for emit_log_hook.

On 2022-Jun-28, Jeff Davis wrote:

> Patch attached. Some kinds of emit log hooks might find it useful to
> also compute the log_line_prefix.

Hmm, maybe your hypothetical book would prefer to use a different
setting for log line prefix than Log_line_prefix, so it would make sense
to pass the format string as a parameter to the function instead of
relying on the GUC global.

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