ConeyLiu opened a new pull request, #7836:
URL: https://github.com/apache/iceberg/pull/7836

   Flink data type could have some customized precision, such as 
`LocalZonedTimestampType(3)`. However, the precision could be lost after 
converting from  Flink type to Iceberg type back and forth. For example:
   ```
   Flink LocalZonedTimestampType(3) -> Iceberg TimestampType
   Iceberg TimestampType -> Flink LocalZonedTimestampType(6)
   ``` 
   So when projecting on the row data to get the equality key, we should create 
the `RowDataProjection` based on the requested flink table schema


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