No documentation exists about ecpg ORACLE comptaible mode

[ideriha.take...@fujitsu.com]

Hi. 
(CCing Michael Meskes)

One of my customers asked me about what oracle compatibility mode in ecpg 
means, 
and I noticed current documentation does not explain ecpg ORACLE compatible 
mode  (ecpg -C ORACLE) in detail.
I myself learned the feature of "-C ORACLE"  from regression test 
(src/interfaces/ecpg/test/compat_oracle) and source code. 

Is lacking documentation intentional or do commit 3b7ab4380 and 3b9b7516f just 
forget adding the explanation?

As for as I know, "ecpg -C ORACLE" is written briefly in ecpg command reference 
and PostgreSQL 11 release note,
but they are not enougn information for users to understand feature of "ecpg -C 
ORACLE".

https://www.postgresql.org/docs/current/app-ecpg.html

---
-C mode
Set a compatibility mode. mode can be INFORMIX, INFORMIX_SE, or ORACLE.
---

https://www.postgresql.org/docs/11/release-11.html#id-1.11.6.21.5.9
---
Add an ecpg mode to enable Oracle Pro*C-style handling of char arrays.

This mode is enabled with -C.
---

On the other hand, informix compatible mode is written in detail.
https://www.postgresql.org/docs/current/ecpg-informix-compat.html

Best regards,
Takeshi Ideriha

RE: No documentation exists about ecpg ORACLE comptaible mode

[ideriha.take...@fujitsu.com]

Bruce Momjian  wrote:

> This is a very good point.  I have studied the issue and created the attached 
> patch to document Oracle-compatibility mode.

Hi Bruce, thank you for writing the document.
I checked it and I'm very glad!

Regards,
Takeshi Ideriha