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ESQL: Add known issue for slow VALUES #123222

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Feb 24, 2025
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ESQL: Add known issue for slow VALUES #123222

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ESQL: Add known issue for slow VALUES
nik9000 Feb 23, 2025
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nik9000 Feb 24, 2025
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Update docs/reference/release-notes/8.16.4.asciidoc
nik9000 Feb 24, 2025
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6 changes: 6 additions & 0 deletions docs/reference/release-notes/8.16.4.asciidoc
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Expand Up @@ -39,4 +39,10 @@ Snapshot/Restore::
Ingest Node::
* Improve memory aspects of enrich cache {es-pull}120256[#120256] (issues: {es-issue}96050[#96050], {es-issue}120021[#120021])

[discrete]
[[known-issues-8.16.4]]
=== Known issues

ES|QL::

* `VALUES` aggregate function can run for a long, long time when collecting many, many groups. This can consume a thread for days at the worst case. Fixed by {es-pull}#123073[#123073] and available in 8.16.5, 8.17.3, 8.18.0, and all releases after that.
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@nik9000 any way we can quantify "many" here?

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It's n^2 so it's a sliding scale. But millions of buckets can run for days. Hundreds of thousands of buckets can run for many minutes. I'll push something with that in it.