Hi , I'm currently working on Flink with a simple stock market 
analysis.Basically i need to have the sum of 100 element (Count Window)(sliding 
size : 10) and  also sum of 20 element(Count Window) (sliding size: 10) 
respectively. I realised that i have to calculate the both sum on 2 different 
stream respectively and so i did. Now i have 2 streams 1 containing the sum of 
100 element and the other one containing the sum of 20 element. Now i wanted to 
join the both datastream into 1 datastream. I'm using join and i realised that 
it can only supports Time Windows and Tumbling Window? Is there any other 
functions that i can use to solve my problem?





sum to become:


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