Issue Navigator - MongoDB

SERVER-33966
redundant $sort in aggregation prevents best $limit $sort consolidation
SERVER-33920
Optimize transformation from BSON to Document in aggregation framework
SERVER-30474
leading $facet with each facet beginning with $match should add $match before $facet
SERVER-29010
Coalesce adjacent exclusion $project stages and non-overlapping $addFields stages
SERVER-28980
aggregation can subsume $sort into $group when $first/$last are present
SERVER-28942
sort by shard key or prefix of shard key may not require merge before group
SERVER-28592
Move $sample earlier in the aggregation pipeline
SERVER-28454
Make more of an effort to move $match stages through $redact stages
SERVER-28312
take slice or element of array before materializing it
SERVER-27744
merge sequential $project stages and $addFields stages when appropriate
SERVER-27598
when unwind includes "preserveNullAndEmptyArrays" limit stage that follows it can be also included before it
SERVER-27389
Use a covered index scan if $sample is the first stage and only the _id is needed
SERVER-25900
Investigate converting TeeBuffer to return an entire batch at once, not one at a time
SERVER-25897
Add a priming stage to Pipeline execution to help determine if further optimization can happen.
SERVER-23991
$graphLookup should optimize with $match
SERVER-23033
Implement getDependencies for $redacts that don't use $$DESCEND
SERVER-22760
Sharded aggregation pipelines which involve taking a simple union should merge on mongos
SERVER-22631
Improve efficiency of matching during an aggregation pipeline.
SERVER-22404
Extend MatchExpression to support matching Documents
SERVER-22403
Clean up dynamic_cast's in pipeline directory
SERVER-22402
Add dependency tracking to the $match stage
SERVER-22093
Take advantage of the COUNT_SCAN optimization when a pipeline has no dependencies
SERVER-21612
Combine post $lookup $match on looked up field
SERVER-21312
$lookup should batch query requests
SERVER-21284
$lookup should cache query results
SERVER-21200
$match w/ $text should not use DocumentSource::setSource() to enforce pipeline position
SERVER-21022
Coalesce $group and $limit in aggregation pipeline
SERVER-20506
Conditionally order $match with $unwind
SERVER-20378
Clean up DocumentSourceUnwind::Unwinder, attempt to share code with $lookUp
SERVER-20092
Add ability for DocumentSourceCursor to coalesce with a $project stage if it is doing an equivalent projection
SERVER-20066
Query planner should consider index scans on empty query predicates
SERVER-19643
Aggregation on unversioned connection should not use SHARDING_FILTER execution stage
SERVER-19546
Prevent $project's from being sent to shard and merge pipes.
SERVER-19542
Combine logic for all pipeline optimizations that involve swapping stages into one function
SERVER-19400
Move the checking for authorization from the pipeline level to the stage level.
SERVER-19153
Conditionally push $match before $project
SERVER-18940
Optimise sharded aggregations that are targeted to a single shard
SERVER-18734
The match $in operator is using a ValueSet(std::set)
SERVER-18733
Streamline set cache optimization for set operations
SERVER-18678
Sharded Agg should use query in $geoNear stage for targeting
SERVER-15099
Improve dependency generation for $unwind
SERVER-13703
Presence of extraneous $project causes a less efficient plan to be used
SERVER-9507
Optimize $sort+$group+$first pipeline to avoid full index scan
SERVER-9445
Misc improvements to Sorter
SERVER-9370
Optimize $match $unwind $match sequence in pipeline
SERVER-6804
ExpressionCompare::optimize should optimize two constants to an ExpressionConstant
SERVER-5477
when sharded, no need to merge groups if $group _id is the shard key or original document _id
SERVER-5091
parallelize aggregating operations ($group and $sort)
SERVER-4507
aggregation: optimize $group to take advantage of sorted sequences
SERVER-4506
aggregation: optimize by pushing matches to earlier in a pipeline

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