abhishekrb19 opened a new pull request, #19386:
URL: https://github.com/apache/druid/pull/19386
Adds a `now()` expression macro to Druid's native expression. It returns
the current system timestamp in milliseconds since epoch, evaluated per row at
processing time. Intended primarily for ingestion-time troubleshooting - e.g.,
capturing `now() - __time` as an ingestion_lag_ms dimension to measure
end-to-end pipeline delay.
Release note
Added `now()` expression function that returns the current system
timestamp in milliseconds since epoch. Useful at ingestion time for
troubleshooting pipeline delays (e.g., now() - __time). Note: `now()` is
non-deterministic and should not
be used to overwrite `__time`.
This PR has:
- [x] been self-reviewed.
- [x] added documentation for new or modified features or behaviors.
- [x] a release note entry in the PR description.
- [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.
- [x] been tested in a test Druid cluster.
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