jackye1995 commented on a change in pull request #2101:
URL: https://github.com/apache/iceberg/pull/2101#discussion_r560522744
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File path: site/docs/spark.md
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@@ -258,6 +258,38 @@ 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
+```
+
+### `ALTER TABLE ... DROP PARTITION FIELD`
Review comment:
Thanks for the information, I updated a warning block for this. I also
added a line at the top Spark feature support table suggesting they need
extensions enabled.
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