ESQL: Introduce a new aggregation mode to handle the node level reduction step

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ESQL: Introduce a new aggregation mode to handle the node level reduction step #108468

Open astefan opened 2 months ago

astefan commented 2 months ago

Description

Spawned from https://github.com/elastic/elasticsearch/pull/107876#pullrequestreview-2023294281. Essentially, AggregateExec.Mode needs a new flavor of PARTIAL aggregation step for the node-level reduction. This will be used in PlannerUtils.dataNodeReductionPlan and when we create the physical operations to be scheduled by the driver.

elasticsearchmachine commented 2 months ago

Pinging @elastic/es-analytical-engine (Team:Analytics)