[9.1] Avoid O(N^2) in VALUES with ordinals grouping (#130576) #130771
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Using the VALUES aggregator with ordinals grouping led to accidental quadratic complexity. Queries like FROM .. | STATS ... VALUES(field) ... BY keyword-field are affected by this performance issue. This change caches a sorted structure - previously used to fix a similar O(N^2) problem when emitting the output block - during the merging phase of the OrdinalGroupingOperator.
dnhatn
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:Analytics/ES|QL
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Backports the following commits to 9.1: