Re: Patch: Allow substring/replace() to get/set bit values

> Thanks!  Please add your patch here:
> 
> https://commitfest.postgresql.org/action/commitfest_view/open
> 


Ok; but what about what I said about the difference between bit/string substring?
That affects overlay behaviour for bit...


I've even got 

"ERROR:  invalid memory alloc request size 4244635647" 

with:


SELECT substring(B'1111000000000001' from 5 for -2);

(this is 8.4.2, windows version, not modified...)



test=# SELECT substring(B'1111000000000001' from 1 for -1);
substring 
------------------
1111000000000001
(1 row)


test=# SELECT substring('1111000000000001' from 1 for -1);
ERROR:  negative substring length not allowed