[8.19] Backport ES|QL sample agg function #129627
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* ES|QL SAMPLE aggregation function * [CI] Auto commit changes from spotless * ThreadLocalRandom -> SplittableRandom * Update docs/changelog/127629.yaml * fix yaml test * Add SampleTests * docs + example * polish code * mark generated imports * comment with algorith description * use Randomness.get() * close properly * type checks * reuse hash * regen some files * [CI] Auto commit changes from spotless --------- Co-authored-by: elasticsearchmachine <[email protected]>
* Fix memory tracking of ES|QL sample agg * [CI] Auto commit changes from spotless * polish code --------- Co-authored-by: elasticsearchmachine <[email protected]>
This removes a ton of the tricky juggling we do for generated java files to keep the imports in order. Instead, we just live with them being out of order a little. It's not great, but it's so so so much easier than the terrible juggling we had been doing.
This builds the infrastructure to disable spotless and some checkstyle rules on generated imports. This works around the most frustrating part of ESQL's string template generated files - the imports. It allows unused and out of order imports. This can let us remove a lot of cumbersome, tricky, and fairly useless `$if$` blocks from the templates.
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