Hi Timo, Thanks a lot for your reply. I think the cause to this problem is that TableEnvironment.getTableEnvironment() returns the actual TableEnvironment implementations instead of an interface or an abstract base class. Even the porting of FLINK-11067 is done, I'm afraid that the problem may still exist. For example, for batch TableEnvironment, both java.BatchTableEnvironment and api.BatchTableEnvironment may be prompted for import. Could you share more information about what you want to do with the 7 TableEnvironments in FLINK-11067? Especially api.BatchTableEnvironment, api.StreamTableEnvironment and TableEnvironment.
Thanks, Dian > 在 2018年12月11日，下午3:41，jincheng sun <sunjincheng...@gmail.com> 写道： > > Hi Xuefu, > > Thanks for your feedback, and mention the compatibility issues. > You are right the change will result version incompatibility. And we my > plan it's will be released in the version of 1.8.x. > > To be frank, we have considered the compatibility approach, which is to > retain the current TableEnvironment, and then create a new one, such as > "GeneralTableEnvironment" for unified abstraction, and then Deprecated the > TableEnvironment. But we feel that the code is not clean enough, and the > long-term goal is that we need to make StreamTableEnvironment and > BatchTableEnvironment transparent to the user, so I tend to release this > change in 1.8.x, keeping the status quo in 1.7.x. What do you think? Any > feedback is welcome! > > Thanks, > Jincheng > > > Zhang, Xuefu <xuef...@alibaba-inc.com> 于2018年12月11日周二 下午1:13写道： > >> Hi Jincheng, >> >> Thanks for bringing this up. It seems making good sense to me. However, >> one concern I have is about backward compatibility. Could you clarify >> whether existing user program will break with the proposed changes? >> >> The answer to the question would largely determine when this can be >> introduced. >> >> Thanks, >> Xuefu >> >> >> ------------------------------------------------------------------ >> Sender:jincheng sun <sunjincheng...@gmail.com> >> Sent at:2018 Dec 10 (Mon) 18:14 >> Recipient:dev <dev@flink.apache.org> >> Subject:[DISCUSS] Enhance convenience of TableEnvironment in TableAPI/SQL >> >> Hi All, >> >> According to the feedback from users, the design of TableEnvironment is >> very inconvenient for users, and often mistakenly imported by IDE, >> especially for Java users, such as: >> >> ExecutionEnvironment env = ...BatchTableEnvironment tEnv = >> TableEnvironment.getTableEnvironment(env); >> >> The user does not know which BatchTableEnvironment should be imported, >> because there are three implementations of BatchTableEnvironment, shown as >> below: >> >> 1. org.apache.flink.table.api.BatchTableEnvironment 2. >> org.apache.flink.table.api.java.BatchTableEnvironment 3. >> org.apache.flink.table.api.scala.BatchTableEnvironment >> [image.png] >> >> >> This brings unnecessary inconveniences to the flink user. To solve this >> problem, Wei Zhong, Hequn Cheng, Dian Fu, Shaoxuan Wang and myself >> discussed offline a bit and propose to change the inheritance diagram of >> TableEnvironment is shown as follows: >> 1. AbstractTaleEnvironment - rename current TableEnvironment to >> AbstractTableEnvironment, The functionality implemented by Abstract >> TableEnvironment is stream and batch shared.2. TableEnvironment - Create a >> new TableEnvironment(abstract), and defined all methods in >> (java/scala)StreamTableEnvironment and (java/scala)BatchTableEnvironment. >> In the implementation of BatchTableEnviroment and StreamTableEnviroment, >> the unsupported operations will be reported as an error. >> [image.png] >> Then the usage as follows: >> >> ExecutionEnvironment env = …TableEnvironment tEnv = >> TableEnvironment.getTableEnvironment(env) >> For detailed proposals please refer to the Google doc: >> https://docs.google.com/document/d/1t-AUGuaChADddyJi6e0WLsTDEnf9ZkupvvBiQ4yTTEI/edit?usp=sharing >> >> Any mail feedback and Google doc comment are welcome. >> >> Thanks, >> Jincheng >> >>
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