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Re: MDEV-9371 select insert('a', 2, 1, 'b') doesn't return expected 'a'
On Feb 09, Alexander Barkov wrote:
> Hello Sergei,
> Please review a fix for MDEV-9371.
> I'd suggest to push it to 10.0 instead of 5.5,
> as MySQL fixed this bug in 5.6 (not 5.5).
I think 5.5 is fine. It's clearly a bug. And a very safe fix.
> Also, I think it's worthy to backport MDEV-9332 to 10.0 as well,
> because the patch for MDEV-9371 touches the test which
> we modified in MDEV-9332.
Dunno. Is 5.5 affected? Or only 10.0 is affected?
> diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
> index aca66fc..ca0cc47 100644
> --- a/sql/item_strfunc.cc
> +++ b/sql/item_strfunc.cc
> @@ -1212,7 +1212,7 @@ String *Item_func_insert::val_str(String *str)
> length= res->charpos((int) length, (uint32) start);
> /* Re-testing with corrected params */
> - if (start > res->length())
> + if (start + 1 > res->length())
that's fine, of course. But please, add a comment, like
// remember, start = args.val_int() - 1
or something else, whatever you want, to remind about -1.
> return res; /* purecov: inspected */ // Wrong param; skip insert
> if (length > res->length() - start)
> length= res->length() - start;
Chief Architect MariaDB