Agree with Jiatao, I had the same experience and feeling. But it mainly depends 
on the rule creator's preference.

On 2020/11/23 02:42:21, Danny Chan <danny0...@apache.org> wrote: 
> I kind of agree, but it's more like a programming specification, we can
> tell people how to write codes but they may not follow those rules.
> 
> JiaTao Tao <taojia...@gmail.com> 于2020年11月22日周日 下午5:27写道:
> 
> > Why I don't want to debug into "transformTo":
> >
> > 1. It's a common method, if you directly stop here, every rule will stop,
> > or you must stop the specific rule, then step into this method call, it's
> > one more step.
> > 2. There are many contexts in the rule, if you debug into "transformTo",
> > you have to go back to see these.
> >
> >
> > Regards!
> >
> > Aron Tao
> >
> >
> > JiaTao Tao <taojia...@gmail.com> 于2020年11月22日周日 下午5:23写道:
> >
> > > Hi
> > > I've been developed Calcite full time for a quite long time, and I ofter
> > > debug in the rule to see the transformations, but code like this is not
> > > debuging friendly in my opinion:  "call.transformTo(relBuilder.build())"
> > >
> > > I want to see the relBuilder.build()'s result, I have to debug into the
> > > "transformTo" method(you can not evaluate "relBuilder.build()" cuz it's a
> > > stack), if we split this into two lines, we can just stop at the last
> > link:
> > >
> > > RelNode ret = relBuilder.build()
> > > call.transformTo(ret)
> > >
> > > It's not a big deal, but every time I occur this, it has poor
> > experience, hope
> > > to hear the community's opinion.
> > >
> > > Regards!
> > >
> > > Aron Tao
> > >
> >
> 

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