Re: Underscore in positional parameters?

On 19.05.24 16:43, Erik Wienhold wrote:
> On 2024-05-19 07:00 +0200, Alexander Lakhin wrote:
>> I encountered anomalies that you address with this patch too.
>> And I can confirm that it fixes most cases, but there is another one:
>> SELECT $300000000 \bind 'foo' \g
>> ERROR:  invalid memory alloc request size 1200000000
>>
>> Maybe you would find this worth fixing as well.
>
> Yes, that error message is not great. In variable_paramref_hook we
> check paramno > INT_MAX/sizeof(Oid) when in fact MaxAllocSize/sizeof(Oid)
> is the more appropriate limit to avoid that unspecific alloc size error.
>
> Fixed in v4 with a separate patch because it's unrelated to the param
> number parsing. But it fits nicely into the broader issue on the upper
> limit for param numbers. Note that $268435455 is still the largest
> possible param number ((2^30-1)/4) and that we just return a more
> user-friendly error message for params beyond that limit.

I have committed your two v4 patches.

I made a small adjustment in 0001: I changed the ecpg part to also store
the result from strtoint() into a local variable before checking for
error, like you had done in the scan.l part. I think this is a bit
better style. In 0002 you had a typo in the commit message: MAX_INT
instead of INT_MAX.