danny0405 commented on PR #5830:
URL: https://github.com/apache/hudi/pull/5830#issuecomment-1314818826

   > > 
[3981.patch.zip](https://github.com/apache/hudi/files/9977268/3981.patch.zip) 
Thanks for the contribution, have reviewed some of the part, and left a local 
patch here and some comments ~
   > 
   > Why we use writerSchema instead of readerSchema when schema evolution 
disabled? 3981.patch:
   > 
   > ```java
   > public Schema getAvroSchema() {
   >   if (isEmptySchema()) {
   >     return null;
   >   }
   > ```
   
   Actually i'm confused totally by these schema use cases, can we list a 
summary here, in which case we use writer /reader schema, for schema evolution 
enabled/disabled ?


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