HyukjinKwon commented on a change in pull request #34333:
URL: https://github.com/apache/spark/pull/34333#discussion_r732391899
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File path: docs/structured-streaming-programming-guide.md
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@@ -517,6 +517,8 @@ There are a few built-in sources.
- **Rate source (for testing)** - Generates data at the specified number of
rows per second, each output row contains a `timestamp` and `value`. Where
`timestamp` is a `Timestamp` type containing the time of message dispatch, and
`value` is of `Long` type containing the message count, starting from 0 as the
first row. This source is intended for testing and benchmarking.
Review comment:
I mean we could have a separate implementation internally but externally
I wonder if users would just prefer to set an option with single testing source.
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