Peter Eisentraut <peter_e@gmx.net> writes:
> Example:
> create temporary table foo (a int);
> insert into foo values (1);
> alter role peter set temp_buffers = 120;
> ERROR: 22023: invalid value for parameter "temp_buffers": 120
> DETAIL: "temp_buffers" cannot be changed after any temporary tables
> have been accessed in the session.
> Another example:
> set log_statement_stats = on;
> alter role peter set log_parser_stats = on;
> ERROR: 22023: invalid value for parameter "log_parser_stats": 1
> DETAIL: Cannot enable parameter when "log_statement_stats" is true.
> Another example is that in <=9.1, ALTER DATABASE ... SET search_path
> would check the existence of the schema in the current database, but
> that was done away with in 9.2.
> The first example could probably be fixed if check_temp_buffers() paid
> attention to the GucSource, but in the second case and in general there
> doesn't seem to be a way to distinguish "assigning per-database setting"
> and "enacting per-database setting" as a source.
> Ideas?
Perhaps instead of trying to solve the problem as stated, it would be
more useful to put the effort into getting rid of context-sensitive
restrictions on GUC settings. Neither of the examples above seem
particularly essential - they are just protecting incomplete
implementations.
regards, tom lane