hililiwei commented on a change in pull request #3749:
URL: https://github.com/apache/iceberg/pull/3749#discussion_r776944095
##########
File path: site/docs/spark-structured-streaming.md
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@@ -24,7 +24,21 @@ As of Spark 3.0, DataFrame reads and writes are supported.
| Feature support | Spark 3.0| Spark 2.4 |
Notes |
|--------------------------------------------------|----------|------------|------------------------------------------------|
-| [DataFrame write](#writing-with-streaming-query) | ✔ | ✔ |
|
+| [DataFrame write](#writing-with-streaming-query) | ✔ | ✔ |
|
+
+## Streaming Reads
+
+Iceberg supports processing incremental data in spark structured streaming
jobs which starts from a historical timestamp:
+
+```scala
+val df = spark.readStream
+ .format("iceberg")
+ .option(SparkReadOptions.STREAM_FROM_TIMESTAMP,
Long.toString(streamStartTimestamp))
+ .load("database.table_name")
+```
+
+!!! Note
+ Iceberg only supports reading data from append snapshots. Overwrite
snapshots cannot be processed and will cause an exception, similarly, delete
snapshots will cause an exception by default, but deletes may be ignored by
setting `streaming-skip-delete-snapshots=true`.
Review comment:
done
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