Re: [HACKERS] proposal: enhanced stack trace for PL - print param args

Hi

Proposed result:

postgres=# select foo(0, 100);

ERROR:  division by zero

CONTEXT:  PL/pgSQL function foo(double precision) line 3 at RETURN

ARGUMENTS: a=0, b=100

* only function parameters are printed - no local parameters

* the line of arguments will be limited - X chars ?

* the content of variable should be limited - X chars ? - maybe 40 chars

This function can has impact on performance - so it should be explicitly enabled with some GUC - like extra_back_trace or some similar. Probably before any call the function parameters and related out functions should be copied to safe memory context. More it can increase press on Error Memory Context and possibly on log size.