| From: | "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com> |
|---|---|
| To: | 'Masahiko Sawada' <sawada(dot)mshk(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> |
| Cc: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "ikedamsh(at)oss(dot)nttdata(dot)com" <ikedamsh(at)oss(dot)nttdata(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "tgl(at)sss(dot)pgh(dot)pa(dot)us" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | RE: Allow escape in application_name |
| Date: | 2021-12-27 23:57:15 |
| Message-ID: | TYAPR01MB58662175F7FEF5B6A1E6F1E8F5429@TYAPR01MB5866.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Dear Sawada-san,
> Good idea. But the application_name is actually truncated to 63
> characters (NAMEDATALEN - 1)? If so, we need to do substring(... for
> 63) instead.
Yeah, the parameter will be truncated as one less than NAMEDATALEN:
```
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.
```
But in Fujii-san's patch length is picked up by the following SQL, so I think it works well.
```
SELECT max_identifier_length FROM pg_control_init()
```
Best Regards,
Hayato Kuroda
FUJITSU LIMITED
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