HeartSaVioR opened a new pull request #35599:
URL: https://github.com/apache/spark/pull/35599


   ### What changes were proposed in this pull request?
   
   This PR proposes to change the assertion of data type against joining keys 
on stream-stream join to ignore nullability.
   
   ### Why are the changes needed?
   
   The existing requirement on checking data types of joining keys is too 
restricted, as it also requires the same nullability. In batch query (I checked 
with HashJoinExec), nullability is ignored when checking data types of joining 
keys.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, end users will no longer encounter the assertion error on join keys 
with different nullability in both keys.
   
   ### How was this patch tested?
   
   New test added.


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