dongkelun commented on issue #4131:
URL: https://github.com/apache/hudi/issues/4131#issuecomment-1012136193


   @nsivabalan @BenjMaq  In Hudi version 0.9.0, insert takes the last field of 
the schema as the `PRECOMBINE_FIELD` by default. If the field is null, this 
exception may be thrown
   
   ```scala
   PRECOMBINE_FIELD.key -> tableSchema.fields.last.name
   ```


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