stevenzwu commented on code in PR #9179:
URL: https://github.com/apache/iceberg/pull/9179#discussion_r1411432735
##########
docs/flink-queries.md:
##########
@@ -277,6 +277,58 @@ DataStream<Row> stream = env.fromSource(source,
WatermarkStrategy.noWatermarks()
"Iceberg Source as Avro GenericRecord", new
GenericRecordAvroTypeInfo(avroSchema));
```
+### Emitting watermarks
+Emitting watermarks from the source itself could be beneficial for several
purposes, like harnessing the
+[Flink Watermark
Alignment](https://nightlies.apache.org/flink/flink-docs-release-1.18/docs/dev/datastream/event-time/generating_watermarks/#watermark-alignment)
+feature to prevent runaway readers, or providing triggers for [Flink
windowing](https://nightlies.apache.org/flink/flink-docs-release-1.18/docs/dev/datastream/operators/windows/).
Review Comment:
This feature produces better watermark. But I think we don't have to
explicitly say `windowing` here. If someone use low-level event timer triggers
for stateful processing, this also helps.
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