DOCS-13918-aggregation-optimizer (#489)

jason-price-mongodb · jason-price-mongodb · web-flow · commit bb851729b777 · 2022-02-02T10:46:43.000-08:00
Co-authored-by: jason-price-mongodb &lt;jshfjghsdfgjsdjh@aolsdjfhkjsdhfkjsdf.com&gt;
diff --git a/source/core/aggregation-pipeline-optimization.txt b/source/core/aggregation-pipeline-optimization.txt
@@ -383,6 +383,13 @@ option, the ``explain`` output shows the coalesced stage:
      }
    }
 
+Indexes
+-------
+
+Starting in MongoDB 4.2, in some cases, an aggregation pipeline can use
+a ``DISTINCT_SCAN`` index plan, which typically has higher performance
+than ``IXSCAN``.
+
 Example
 -------
 .. _agg-sort-skip-limit-sequence:

Original file line number	Diff line number	Diff line change
@@ -383,6 +383,13 @@ option, the ``explain`` output shows the coalesced stage:
`383`	`383`	`}`
`384`	`384`	`}`
`385`	`385`
	`386`	`+Indexes`
	`387`	`+-------`
	`388`	`+`
	`389`	`+Starting in MongoDB 4.2, in some cases, an aggregation pipeline can use`
	`390`	+a ``DISTINCT_SCAN`` index plan, which typically has higher performance
	`391`	+than ``IXSCAN``.
	`392`	`+`
`386`	`393`	`Example`
`387`	`394`	`-------`
`388`	`395`	`.. _agg-sort-skip-limit-sequence:`