Does this only affect the functions and operations we currently have in SQL and have no effect on tables, right? Looks like this is an orthogonal concept with Catalog? If the answer are both yes, then the catalog function will be a weird concept?
Best, Kurt On Tue, Sep 3, 2019 at 8:10 PM Danny Chan <yuzhao....@gmail.com> wrote: > The way you proposed are basically the same as what Calcite does, I think > we are in the same line. > > Best, > Danny Chan > 在 2019年9月3日 +0800 PM7:57，Timo Walther <twal...@apache.org>，写道： > > This sounds exactly as the module approach I mentioned, no? > > > > Regards, > > Timo > > > > On 03.09.19 13:42, Danny Chan wrote: > > > Thanks Bowen for bring up this topic, I think it’s a useful > refactoring to make our function usage more user friendly. > > > > > > For the topic of how to organize the builtin operators and operators > of Hive, here is a solution from Apache Calcite, the Calcite way is to make > every dialect operators a “Library”, user can specify which libraries they > want to use for a sql query. The builtin operators always comes as the > first class objects and the others are used from the order they appears. > Maybe you can take a reference. > > > > > > [1] > https://github.com/apache/calcite/commit/9a4eab5240d96379431d14a1ac33bfebaf6fbb28 > > > > > > Best, > > > Danny Chan > > > 在 2019年8月28日 +0800 AM2:50，Bowen Li <bowenl...@gmail.com>，写道： > > > > Hi folks, > > > > > > > > I'd like to kick off a discussion on reworking Flink's > FunctionCatalog. > > > > It's critically helpful to improve function usability in SQL. > > > > > > > > > https://docs.google.com/document/d/1w3HZGj9kry4RsKVCduWp82HkW6hhgi2unnvOAUS72t8/edit?usp=sharing > > > > > > > > In short, it: > > > > - adds support for precise function reference with fully/partially > > > > qualified name > > > > - redefines function resolution order for ambiguous function > reference > > > > - adds support for Hive's rich built-in functions (support for Hive > user > > > > defined functions was already added in 1.9.0) > > > > - clarifies the concept of temporary functions > > > > > > > > Would love to hear your thoughts. > > > > > > > > Bowen > > > > >
