jackye1995 commented on a change in pull request #2101:
URL: https://github.com/apache/iceberg/pull/2101#discussion_r561120510
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File path: site/docs/spark.md
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@@ -258,6 +258,47 @@ ALTER TABLE prod.db.sample DROP COLUMN id
ALTER TABLE prod.db.sample DROP COLUMN point.z
```
+### `ALTER TABLE ... ADD PARTITION FIELD`
+
+```sql
+ALTER TABLE prod.db.sample ADD PARTITION FIELD catalog -- identity transform
+ALTER TABLE prod.db.sample ADD PARTITION FIELD bucket(16, id)
+ALTER TABLE prod.db.sample ADD PARTITION FIELD truncate(data, 4)
+ALTER TABLE prod.db.sample ADD PARTITION FIELD years(ts)
+-- use optional AS keyword to specify a custom name for the partition field
+ALTER TABLE prod.db.sample ADD PARTITION FIELD bucket(16, id) AS shard
+```
+
+!!! Warning
+ Changing partitioning will change the behavior of dynamic writes, which
overwrite any partition that is written to.
Review comment:
Yes. Yeah the term is a bit convoluted, but I don't have a better way
either. I think the example next line should make this sentence clear to
readers.
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