jihoonson opened a new pull request #11626:
URL: https://github.com/apache/druid/pull/11626
### Description
This PR adds a new function, `sleep`, that makes the current thread sleep
for the given amount of seconds. This function is applied per row, and thus
Druid does not guarantee the consistent sleep time across queries. Instead, the
actual sleep time can vary depending on how much parallelism is used for each
query. As a result, this function is intended to use only for testing when you
want to keep some query running for a long period.
<hr>
##### Key changed/added classes in this PR
* `Sleep`
<hr>
This PR has:
- [x] been self-reviewed.
- [x] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [x] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
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