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Re: Question about integer out of range in function

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On 5/14/21 1:38 AM, Condor wrote:

Hello ppl,

I have a question about ERROR:  integer out of range in one function.
I modify the generate_ulid() function to accept also UNIX timestamp as input parameter.

I drop old function and make new one:

CREATE FUNCTION generate_ulid(fromtime bigint default 0)

Then I declare two new variables:

   rand_int   INTEGER;
   new_time   BIGINT;

and then begin:

 BEGIN
   -- 6 timestamp bytes
   IF fromtime = 0 THEN
     unix_time = (EXTRACT(EPOCH FROM NOW()) * 1000)::BIGINT;
   ELSE
     rand_int = (random() * 1000)::INT;
     new_time = fromtime * 1000; -- here is line 19
     unix_time = (new_time + rand_int)::BIGINT;
   END IF;

(Yes, I know it's can be one line, but this is for debug)

When I start the function I receive error:

test_db=# select generate_ulid(extract(epoch from now())::int);
ERROR:  integer out of range
CONTEXT:  PL/pgSQL function generate_ulid(integer) line 19 at assignment

If I modify line 19 to : new_time = (fromtime * 1000)::BIGINT;

Everything is work. Well, until I write the email I figured out, but I don't know is this normal behavior or just a problem.

I think, this is happened because I send INT to function generate_ulid(extract(epoch from now())::int) but in function I expect this to be BIGINT and my variable is cast automatic to INT.

My question is this normal and should input param not be treated as bigint automatic as defined ? Did I can change whit this way input type to other functions for example get_random_bytes(34423423423423423424234::BIGINT) ?

What is fromtime?  Since MAX_INT is 2147483648, and you're multiplying fromtime by 1000, the largest that fromtime can be is 2147483 without some INTEGER variable (possibly internal) overflowing.

Version: PostgreSQL 13.2 on x86_64-slackware-linux-gnu, compiled by x86_64-slackware-linux-gcc (GCC) 10.3.0, 64-bit

--
Angular momentum makes the world go 'round.





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