geserdugarov commented on issue #12155:
URL: https://github.com/apache/hudi/issues/12155#issuecomment-2434953604

   And results of running shows, that for timestamps like `2024-10-24 
10:11:11.234` we get column name `2024-10-24 10` and filter it, which leads to 
hash of `null` for all records.
   ```Text
   Key:2024-10-24 10:11:11.234; new hash: [2024-10-24 10:11:11.234];    current 
hash: [];       new bucket = 0; current bucket = 1
   Key:2024-10-24 10:22:12.345; new hash: [2024-10-24 10:22:12.345];    current 
hash: [];       new bucket = 2; current bucket = 1
   Key:2024-10-24 10:33:13.456; new hash: [2024-10-24 10:33:13.456];    current 
hash: [];       new bucket = 1; current bucket = 1
   Key:2024-10-24 10:44:14.567; new hash: [2024-10-24 10:44:14.567];    current 
hash: [];       new bucket = 0; current bucket = 1
   Key:2024-10-24 10:55:15.678; new hash: [2024-10-24 10:55:15.678];    current 
hash: [];       new bucket = 2; current bucket = 1
   ```


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