AFAK,there's no any plan/ticket for it. If you think it's needed to be 
supported, you can create a tiket in jira[1] for it. 
[1] https://issues.apache.org/jira/projects/FLINK/summary 

Best regards, 
Yuxia 


发件人: "Krzysztof Chmielewski" <krzysiek.chmielew...@gmail.com> 
收件人: "User" <user@flink.apache.org> 
发送时间: 星期二, 2022年 10 月 18日 下午 3:28:26 
主题: SQL Lookup join on nested field 

Hi all, 
I have found an old thread [1] where there was a question about SQL joins on 
nested fields. 

The conclusion was that (quote): 
"temporal table join doesn't support join on a nested join. 
In blink planner, a temporal table join will be translated into lookup join 
which will use the equality condition fields as the lookup keys." 

The thread is from 2020 and I was wondering if there is any plan/ticket about 
adding support for nested fields to lookup join/temporal join 

I've checked this use case on Flink 1.15.2 and it seems still not supported. 

[1] [ https://lists.apache.org/thread/o3fc5lrqf6dbkl9pm0rp2mqyt7mcnsv3 | 
https://lists.apache.org/thread/o3fc5lrqf6dbkl9pm0rp2mqyt7mcnsv3 ] 

Best Regards, 
Krzysztof Chmielewski 
SQL join on nested field 

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