25d74bd0cb
Previously, unmapped aggs try to delegate reduction to a sibling agg that is mapped. That delegated agg will run the reductions, and also reduce any pipeline aggs. But because delegation comes before running pipelines, the unmapped agg _also_ tries to run pipeline aggs. This causes the pipeline to run twice, and potentially double it's output in buckets which can create invalid JSON (e.g. same key multiple times) and break when converting to maps. This fixes by sorting the list of aggregations ahead of time so that mapped aggs appear first, meaning they preferentially lead the reduction. If all aggs are unmapped, the first unmapped agg simply creates a new unmapped object and returns that for the reduction. This means that unmapped aggs no longer defer and there is no chance for a secondary execution of pipelines (or other side effects caused by deferring execution). Closes #33514 |
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