CONTEXT: PL/pgSQL function foo(double precision) line 3 at RETURN
ARGUMENTS: a=0, b=100
+1 This would be useful in cases where an app calls one procedure and then disconnects. It's hard to know which of the thousands of invocations caused the error.
* only function parameters are printed - no local parameters
+1, we'd have no insight into variables inside the function anyway.
* the line of arguments will be limited - X chars ?
+1
* 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.
