liuml07 opened a new pull request #4478:
URL: https://github.com/apache/iceberg/pull/4478
Currently Spark SQL does not allow user to specify 'identifier-fields' when
creating table. This is a PoC effort.
```sql
CREATE TABLE t1(
id BIGINT NOT NULL,
name STRING NOT NULL,
data STRING)
USING iceberg
TBLPROPERTIES ('identifier-fields'='id,name')
```
After this, we can add support for other engines like Hive easily.
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