Re: BUG #17385: "RESET transaction_isolation" inside serializable transaction causes Assert at the transaction end

Hi,

I a bit changed Masahiko Sawada's patch with using Dilip Kumar's 
recommendations (see it in attachment).

About testing.
The most simple path to testing of command "RESET <GUC_string_variable>" 
(with error) that I found:
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1) need to modify "postgresql.conf". Add string:

default_table_access_method = 'heapXXX'

2) start PostgreSQL;

3) start "psql" and execute command:

RESET default_table_access_method;

After that we get an error:

ERROR:  invalid value for parameter "default_table_access_method": "heapXXX"
DETAIL:  Table access method "heapXXX" does not exist.

Without attached patch command "RESET default_table_access_method;" 
returns no error.
----
Probably no reason to create new tap-test for this case...

With best regards,
Dmitry Koval.