Add NAMEDATALEN to PG_CONFIG?

On 05/15/2017 04:27 PM, Andy Johnson wrote:

Is there a way to find NAMEDATALEN in a database, other than looking at
the source? If not could it be added to the PG_CONFIG eventually?

Andy Johnson

https://www.postgresql.org/docs/9.6/static/runtime-config-preset.html

"max_identifier_length (integer)

Reports the maximum identifier length. It is determined as one less
than the value of NAMEDATALEN when building the server. The default
value of NAMEDATALEN is 64; therefore the default max_identifier_length
is 63 bytes, which can be less than 63 characters when using multibyte
encodings.
"

So:

production=# show max_identifier_length ;
max_identifier_length
-----------------------
63

--
Adrian Klaver
adrian.klaver@aklaver.com

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Andy Johnson <andy@asjohnson.com> writes:

Is there a way to find NAMEDATALEN in a
database, other than looking at the
source?

select typlen from pg_type where typname = 'name';

If not could it be added to the
PG_CONFIG eventually?

Seems like it would only make sense to do that if we supported
configuring NAMEDATALEN, which we don't really: you have to
manually edit pg_config_manual.h, and how well the result works
is on your own head.

regards, tom lane

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