Re: [proposal] Add an option for returning SQLSTATE in psql error message

Currently with 10 head
ERROR:  could not determine polymorphic type because input has type unknown
With 9 head
ERROR:  could not determine polymorphic type because input has type "unknown"

Another option could be: set display error to none and let user's
script do some regular expression on pdsl variable.
On Sun, Dec 2, 2018 at 5:05 PM Pavel Stehule <pavel.stehule@gmail.com> wrote:
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> ne 2. 12. 2018 v 16:56 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal:
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>> didier <did447@gmail.com> writes:
>> > Currently on error psql is printing Postgres' PQerrorMessage text, but
>> > there's no guarantee these messages are constant between Postgres
>> > versions and it's a pain when using psql for writing regression tests,
>>
>> I don't buy that argument.  We use psql's normal display in all the
>> regular regression tests, and it's not a big maintenance problem.
>> If the error message changes, that's usually interesting in itself.
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> our tests are not against different PostgreSQL releases. When you have a code, that should to support more PostgreSQL
releases,then it is sometimes difficult. 
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>> Also, if it does change, it's often because you're hitting a different
>> error-detection test, which more than likely is throwing a different
>> SQLSTATE anyway.
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>> Lastly, because the SQL spec has been rather miserly in assigning
>> SQLSTATEs in some areas, there are lots of cases where the same
>> SQLSTATE is used for several distinct errors; for instance
>> ERRCODE_UNDEFINED_OBJECT covers a lot of ground.  Do you really
>> want your test cases to be unable to distinguish those?
>>
>> There might be a use-case for showing only SQLSTATE, but writing
>> regression tests doesn't seem like a good example.
>>
>>                         regards, tom lane
>>