Fix #GROUPBY duplicate counts with query model #2388
Merged
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When query model mapping is applied to a document before grouping and aggregating, it is possible for multiple fields to be mapped to the same root model mapping with the same value, resulting in duplicate field-value pairings that were incorrectly included in grouping and aggregation.
Ensure that duplicate field-value pairings are disregarded. Add tests to verify this and update documentation to include details about how model mapping affects the #GROUPBY function.
Fixes #2360