codope commented on PR #5771:
URL: https://github.com/apache/hudi/pull/5771#issuecomment-1195822628

   > We need some exception handling to handle cases where key fields are 
suddenly introduced after a few commits? This is like adding a key to an 
existing table, which some databases allow, but for simplicity, we can just 
error out for now.
   > 
   > Plus a bigger discussion is whether we disable metafields as well. This 
will make simple data size and write performance on par, and simplify it for 
the simple spark user (as we saw with the recent benchmarks put out)
   > 
   > Can you comment on whether clustering will work on this. I think it will - 
but something to verify
   
   Yes, verified that clustering works. 
   So, there are couple of followups in this PR:
   1. validations to ensure user is not updating w/o record key
   2. disable meta fields when doing bulk insert w/o key or precombine field.
   
   I'll address them shortly.


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