[8.18] Fix empty VALUES with ordinals grouping (#130861) #130873
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We should not build the sorted structure for the ordinal grouping operator if the requested position is larger than maxGroupId. This situation occurs with nulls. We should benchmark the ordinal blocks and consider removing the ordinal grouping operator if performance is similar; otherwise, we need to integrate this operator with GroupingAggregatorFunctionTestCase. Relates elastic#130576 (cherry picked from commit f58d291)
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