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SERVER-25173
$substrBytes does not handle negative parameters correctly.

SERVER-25051
$lookup should support an "restrictWithMatch" option

SERVER-24748
Aggregation does not provide a way to access a specific element of an array

SERVER-24714
$graphLookup should be able to apply a filter to the documents it traverses

SERVER-23991
$graphLookup should optimize with $match

SERVER-23980
$graphLookup should spill to disk if allowDiskUse is specified

SERVER-23922
Pushing $match inside $lookup which has an $unwind filters out all documents including those that should match

SERVER-23833
DocumentSourceLookup::getOutputSorts() does not correctly compute sort.

SERVER-23732
Aggregation should optimize an irrelevant $sort preceding a $group

SERVER-23725
Implement $graphLookup.

SERVER-23606
Collapse implementations of isPathPrefixOf

SERVER-23477
Aggregation's streaming $group should become blocking when it evaluates an array field in the _id

SERVER-23469
$match involving field generated from $unwind is pushed ahead of $unwind in pipeline

SERVER-23466
$match should be moved into the query field of the $geoNear stage, where possible

SERVER-23444
Pessimizing moves break compile on clang 3.7+ (expression_tree.h)

SERVER-23436
ProjectionNode::getSort() does not propagate a sort from children.

SERVER-23356
ExpressionSubstrCPTest uses non-NUL terminated char*, and does not properly construct strings with embedded null bytes

SERVER-23330
Optimize aggregation on sharded setup if first stage is exact match on shard key with $in

SERVER-23318
Streaming $group does not handle nullish values correctly.

SERVER-23274
Collections created with the $out aggregation pipeline in MongoDB 3.2 get dropped on replica set election

SERVER-23229
Projection incorrectly returns null value instead of missing field to user if projection is covered

SERVER-23160
error_propagation.js checks for the wrong error message.

SERVER-23138
CanonicalQuery::normalizeTree should optimize a $nor with a single child.

SERVER-23099
Always propagate cursor output sort to aggregation.

SERVER-23029
Aggregation should have a $reverseArray expression.

SERVER-22966
Aggregation should use the output of DocumentSource::getOutputSorts() to optimize wherever possible.

SERVER-22833
MatchExpression::toBSON does not necessarily produce a valid query object.

SERVER-22631
Improve efficiency of matching during an aggregation pipeline.

SERVER-22630
$match should handle geo predicates in a consistent fashion

SERVER-22580
Add $cpLength and $cpSubstr expressions which work via code points

SERVER-22402
Add dependency tracking to the $match stage

SERVER-22246
Objects are no longer treated as literals inside of an array of an aggregation expression

SERVER-22206
$near query operator should validate its arguments

SERVER-22186
MockStage in query_stage_near suite should be replaced with QueuedDataStage

SERVER-22093
Take advantage of the COUNT_SCAN optimization when a pipeline has no dependencies

SERVER-21814
In "commands" readMode, shell should translate negative batchSize to positive batchSize + singleBatch

SERVER-21612
Combine post $lookup $match on looked up field

SERVER-21409
"profile" command with read-only option should not take exclusive database lock

SERVER-21065
Optimizer should consider predicate with "$in" operator having a single argument to be equivalent to the equality operator

SERVER-21022
Coalesce $group and $limit in aggregation pipeline

SERVER-20506
Conditionally order $match with $unwind

SERVER-20169
aggregation: Should have a $range operator to generate a sequence.

SERVER-20163
aggregation: Should have a $zip operator to combine arrays

SERVER-19783
Query parser does not correctly handle geonear predicates with other predicates in the same field

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-18678
Sharded Agg should use query in $geoNear stage for targeting

SERVER-17258
Add $reduce expression operator for rollup of arrays

SERVER-17234
geoNear command should return error for invalid arguments

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