The current sort spilling counters are unreliable for assessing sort performance when an aggregation includes stages that spill via FileBasedSorter. This is because these counters are incorrectly incremented when stages call the shared addAlreadySorted method. To accurately reflect sort-specific performance, the logic for updating the sort spilling counters must be moved outside of the common addAlreadySorted method and into a path exclusive to sorting operations.

The following stages all update the sort spilling counters

• Sort
• Group
• Lookup hash join
• SetWindowFields
• GeoNear
• TextOr
• BucketAuto
• GraphLookup