Hi, James. Thanks very much for your kind reply.
Actually I am not worrying about the polymorphic calls. And I know that
cascading simple if statements works well in some scenarios.
I was just wondering whether a bunch of instance-of would be much slower
than simple comparisons of integers. Let al
Cascading if statements such as the ones generated, are generally faster
than polymorphic calls in java. Do you worry about polymorphic calls to
rel nodes? The map look up is at least a magnitudes more expensive than the
dispatch. The key generation for the map look was also a magnitude more
expe
Hi, James. I just noticed the change. And I have a little concern about
it.
The original implementation uses a switch-case against the class id (an
integer). So it has to regenerate the handler after a new relnode type
arrives. It could be bad for some adhoc optimization processes. But it is
frie
Thank you very much for your answer.
James Starr 于2022年1月17日周一 09:09写道：
> That is old code. The generated code depends on knowing all types of rel
> node, so all the code must be regenerated after discovering a new type or
> rel node. Apache calcite main does not have this requirement.
>
> Jam
That is old code. The generated code depends on knowing all types of rel
node, so all the code must be regenerated after discovering a new type or
rel node. Apache calcite main does not have this requirement.
James
On Sun, Jan 16, 2022 at 4:35 PM guangyuan wang
wrote:
> Yes, I can.
> Here is
Yes, I can.
Here is the link:
https://github.com/apache/calcite/blob/7655bd735f10de5be1eca8bb9af475b3b2ac63b6/core/src/main/java/org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.java#L481
Jacques Nadeau 于2022年1月17日周一 03:09写道：
> Can you please provide a url link to the line of code you a
I hate to bother with such a small question but I feel like I've hit a wall
after spending most of yesterday on it.
I get this when trying to execute a RelNode expression as a query, it seems
to
be because the "SchemaPlusImpl" throws "UnsupportedException" for the
"snapshot"
function.
https://git
Can you please provide a url link to the line of code you are referring to
in github?
On Sat, Jan 15, 2022, 5:52 PM guangyuan wang
wrote:
> Thank you very much for your answer.
> I'm reading source code these days, I'm a little confused about the "
> JaninoRelMetadataProvider.revise()" method.
>
