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Diffstat (limited to 'src/mongo/db/query/stage_types.h')
| -rw-r--r-- | src/mongo/db/query/stage_types.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mongo/db/query/stage_types.h b/src/mongo/db/query/stage_types.h index ecbacb9068a..cb1ffb391d1 100644 --- a/src/mongo/db/query/stage_types.h +++ b/src/mongo/db/query/stage_types.h @@ -38,6 +38,11 @@ namespace mongo { STAGE_AND_SORTED, STAGE_COLLSCAN, + // If we're running a .count(), the query is fully covered by one ixscan, and the ixscan is + // from one key to another, we can just skip through the keys without bothering to examine + // them. + STAGE_COUNT, + // If we're running a distinct, we only care about one value for each key. The distinct // stage is an ixscan with some key-skipping behvaior that only distinct uses. STAGE_DISTINCT, |