It is used in innodb's implementation of handler::position, to copy the key from the record buffer, which is also used to be record[0] On Tue, 17 Dec 2019 at 01:20, Sergei Golubchik <serg@mariadb.org> wrote:
Hi, Nikita!
On Dec 06, Nikita Malyavin wrote:
Hi Sergei!
I traced out the problem I faced with refs comparison -- It's in key_copy implementation, which uses field->get_key_image, which in turn copied data to the buffer passed, but from `field->ptr`. The latter is important -- it means, current key_copy implementation always copies data from table->record[0].
I see. It looks like so far all usages of key_copy() used record[0] indeed.
But as far as I can see, you're also using key_copy() with record[0], so why would you need that fix?
Regards, Sergei VP of MariaDB Server Engineering and security@mariadb.org
-- Yours truly, Nikita Malyavin