Thanks a lot Sergei. This information is very helpful.
I think this will be my (initial) attempt at implementing ICP for
TokuDB. I will return the full pushed condition to MySQL, but I will
use the information passed down to filter all index_next,
index_next_same, and index_prev calls. This way, i
On Thu, Feb 14, 2013 at 02:24:57PM -0500, Zardosht Kasheff wrote:
> Also, can somebody please explain how handler_index_cond_check checks
> index conditions? The key function seems to be item->val_int. How does
> this get each value and check check conditions?
Function handler_index_cond_check() i
Hi Zardosht,
On Thu, Feb 14, 2013 at 11:31:13AM -0500, Zardosht Kasheff wrote:
> Thanks for the feedback. What makes this feature a little difficult
> for me to grasp is the requirement that the engine is responsible for
> doing some of the condition checking, and that MySQL is doing none of
> the
Also, can somebody please explain how handler_index_cond_check checks
index conditions? The key function seems to be item->val_int. How does
this get each value and check check conditions?
On Thu, Feb 14, 2013 at 11:31 AM, Zardosht Kasheff wrote:
> Hello Sergei,
>
> Thanks for the feedback. What
Hello Sergei,
Thanks for the feedback. What makes this feature a little difficult
for me to grasp is the requirement that the engine is responsible for
doing some of the condition checking, and that MySQL is doing none of
the checking.
Here are the handler cursor API functions:
index_first
index
Hi Zardosht,
On Tue, Feb 12, 2013 at 11:29:12PM -0500, Zardosht Kasheff wrote:
> Is there any documentation for what a storage engine needs to do to
> implement index condition pushdown in MariaDB 5.5? I see some related
> things, such as handler_index_cond_check, HA_DO_INDEX_COND_PUSHDOWN,
> and
Hello,
Is there any documentation for what a storage engine needs to do to
implement index condition pushdown in MariaDB 5.5? I see some related
things, such as handler_index_cond_check, HA_DO_INDEX_COND_PUSHDOWN,
and idx_cond_push, but I don't understand how these all interact with
each other.
T
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