Alvaro Herrera <> writes:
>> +       
>> <entry><function>show_substring_limit()</function><indexterm><primary>show_substring_limit</primary></indexterm></entry>
>> +       
>> <entry><function>set_substring_limit(real)</function><indexterm><primary>set_substring_limit</primary></indexterm></entry>

> I don't quite understand why aren't we using a custom GUC variable here.

Presumably this is following the existing set_limit() precedent
in pg_trgm.  But I tend to agree that that's a crummy precedent
and we should not extend it.

Let's invent a custom GUC for the regular limit, mark show_limit()
and set_limit as deprecated, and then make just a custom GUC for
this other limit.

                        regards, tom lane

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