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From Feng Zhu <wellfeng...@gmail.com>
Subject Re: Question of Calcite Dynamic Code Generation Feature
Date Thu, 14 May 2020 03:17:31 GMT
 Codegen is a common technique for performance. You can find its history
from some research work (e.g. [1]).

[1] “Efficiently Compiling Efficient Query Plans for Modern Hardware,”
PVLDB, vol. 4, no. 9, pp. 539–550, 2011
https://www.vldb.org/pvldb/vol4/p539-neumann.pdf

徐泷泽 <15258826527@qq.com> 于2020年5月14日周四 上午2:54写道:

> Hi buddies !
> Our team is working on developing a&nbsp; mulit data source sql engine use
> Calcite.But something confuse us,&nbsp; why calcite generate Java code
> dynamicly on SQL query, it seen have performance issues in my opinion.
> And building dynamic code object is very hard,the code is unreadable and
> hard to understood, futhermore we can not debug it.
>
>
> i wander why it was designed like that, what advantage&nbsp; of that .we
> search on internet,&nbsp;
> but nobody can realy explain it(may be we not goot at search, and poor
> english).
> so anybody can tell me the history of this, or give us some article.
>
>
> applogize for my poor english,&nbsp; hope you know what i'm taking aboult.
> thank you very very very much !

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