Thanks Danny
Regards!
Aron Tao
Danny Chan 于2021年5月27日周四 下午8:31写道：
> Jia Tao ~
> The hints is production ready, we have implements many hints internal for
> our Flink engine, such as the table hints and query hints.
>
> The `RelBuilder#project` was modified to support hints already, one
Jia Tao ~
The hints is production ready, we have implements many hints internal for
our Flink engine, such as the table hints and query hints.
The `RelBuilder#project` was modified to support hints already, one reason
for hints lost is that the projection are dropped for some reason(
maybe some
Hi
Indeed, there's some situation will lose hints, like RelBuilder#project, we
just construct a project without hints(ImmutableList.of()), so it will lose
hints too.
IMO, it's not ready for production, so finally, we give up this feature.
Currently, hints occurs some times in the mail list, proves
Hi ~
We have interface RelHintsPropagator for hints propagation customization,
but you may need to modify the code of the rule a little bit.
Best,
Danny Chan
Taras Ledkov 于2021年5月26日周三 下午7:26写道：
> Hi,
>
> I am trying to figure out how to use hints correctly.
>
> My case:
> I've registered
My fear, when we introduced hints, was that there would be many cases
where people would hope that rules propagate hints and the rules do
not; and that in some cases, the expected behavior isn't even clear.
Maybe this can be addressed by the power of open source: people find
an issue, submit a
Hi Taras,
I haven't used hints much but what you describe sounds like a bug.
I would expect that rules should preserve hints if possible. I guess that
if a rule removes an operator completely then it may not make sense to
retain the hints.
Best,
Stamatis
On Wed, May 26, 2021, 1:26 PM Taras
Hi,
I am trying to figure out how to use hints correctly.
My case:
I've registered hint for Aggregate node to force expand DISTINCT aggregate.
Because is some cases plan with DISTINCT aggregate to JOIN cannot be
chosen by the cost.
I see that different rules treat hints differently.
e.g.:
-
