manuzhang commented on code in PR #13127:
URL: https://github.com/apache/iceberg/pull/13127#discussion_r2102701620


##########
docs/docs/flink-writes.md:
##########
@@ -75,7 +75,7 @@ Iceberg supports `UPSERT` based on the primary key when 
writing data into v2 tab
     ```
 
 !!! info
-    OVERWRITE and UPSERT can't be set together. In UPSERT mode, if the table 
is partitioned, the partition fields should be included in equality fields.
+    OVERWRITE and UPSERT can't be set together. In UPSERT mode, if the table 
is partitioned, the source columns of partition fields should be included in 
equality fields.

Review Comment:
   Basically descriptions of the following codes
   
   
https://github.com/apache/iceberg/blob/91dff9886e6e6c494f6a970129f4c08487c98a0d/flink/v2.0/flink/src/main/java/org/apache/iceberg/flink/sink/FlinkSink.java#L537-L545
   
   I just noticed the error message is not accurate either. For a table with 
partition field `days(ts)`, it's `ts` that's required to be included in 
equality fields. We can't add `days(ts)` to equality fields. 



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