luoyuxia commented on issue #6153:
URL: https://github.com/apache/iceberg/issues/6153#issuecomment-1308443668
May the reason is that the key in source is `id`, but the primary key in
sink `dt,id`. The primary keys for source and sink aren't equal.
Is possible for the following case?
```
+I['bob', 1, 20221109]
-U['bob', 1, 20221109]
+U['bob', 1, 20221110]
```
And then in the upsert iceberg, `+I['bob', 1, 20221109]`, +U['bob', 1,
20221110] will be considered as different records since they has different
keys.
You can try to update you sink to
```
CREATE TABLE IF NOT EXISTS iceberg.test_db.test_cdc(
`username` STRING,
`id` int,
start_time String,
`dt` string,
PRIMARY KEY(`id`) NOT ENFORCED
)partitioned by (dt)
WITH (
'write.format.default'='parquet',
'format-version' = '2' ,
'write.upsert.enabled'='true',
'location' = 's3a://xxxxxx/xxx/xxx'
);
```
and see whether the duplicated records are still in here or not.
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