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edited Oct 24, 2017 at 20:55Starting with MongoDB version 3.0, simply changing the order from
collection.aggregate(...).explain()to
collection.explain().aggregate(...)will give you the desired results (documentation here).
For older versions >= 2.6, you will need to use the explain option for aggregation pipeline operations
explain:true
db.collection.aggregate([{ $project : { "Tags._id" : 1 }},{ $unwind : "$Tags" },{ $match: {$or: [{"Tags._id":"tag1"},{"Tags._id":"tag2"}]}},{ $group: {_id : "$_id",count: { $sum:1 }}},{$sort: {"count":-1}}An important considera...
Content Under CC-BY-SA license oop - What is the difference between association, …
WEBMay 20, 2009 — System complexity can be measured simply by looking at a UML class diagram and evaluating the association, aggregation, and composition relationship lines. The way to measure complexity is to …
Mongodb Explain for Aggregation framework - Stack …
WEBOct 3, 2012 — As at MongoDB 3.4, the Aggregation Framework explain option provides information on how a pipeline is processed but does not support the same level of detail as the executionStats mode for a find() …
c# - LINQ Aggregate algorithm explained - Stack …
WEBAug 18, 2011 — Aggregate method is an extension method for generic collections. Aggregate method applies a function to each item of a collection. Not just only applies a function, but takes its result as initial …
- Question & Answer
oop - What is the difference between aggregation, composition …
WEBAggregation implies a relationship where the child can exist independently of the parent. Example: Class (parent) and Student (child). Delete the Class and the Students still …
oop - Inheritance vs. Aggregation - Stack Overflow
WEBAggregation: create new functionality by taking other classes and combining them into a new class. Attach an common interface to this new class for interoperability with other …
relationship - Implementation difference between …
WEBAug 9, 2012 — Aggregation implies a relationship where the child can exist independently of the parent. For example, Bank and Employee, delete the Bank and the Employee still exist. whereas Composition implies a …
What are aggregates and why they are special - Stack Overflow
WEBWhat are aggregates and why they are special. Formal definition from the C++ standard (C++03 8.5.1 §1): An aggregate is an array or a class (clause 9) with no user-declared …
java - Aggregation versus Composition - Stack Overflow
WEBThe difference between composition and aggregation has nothing to do with whether the part can exist only inside the whole or not (an engine can exist outside a car, yet their …
java - Association vs. Aggregation - Stack Overflow
WEBAggregation: A owns B, B belongs to A. Association: A uses B, A is related to B in a given way. (Composition and Aggregation are special types of associations.) In Java, …
Explain the aggregate functionality in Spark (with Python and Scala)
WEBI will explain the concept of Aggregate operation in Spark as follows: Definition of the aggregate function **def aggregate** (initial value)(an intra-partition sequence …
How do I use aggregation operators in a $match in MongoDB (for …
WEBOct 2, 2012 — Let's introduce a project stage in this aggregation pipeline: db.companies.aggregate([{ $match: { founded_year: 2004 } }, { $project: { _id: 0, …
difference between association and aggregation - Stack Overflow
WEBOct 24, 2012 — Aggregation is an Association relationship where the Association can be considered the containing class 'Owning' the contained class, and the lifetime of that …
What is the difference between composition and aggregation?
WEBMay 1, 2009 — Aggregation is used to represent ownership or a whole/part relationship, and composition is used to represent an even stronger form of ownership. With …
C# code for association, aggregation, composition - Stack Overflow
WEBSep 26, 2012 — Aggregation: Aggregation is a special type of Association. Aggregation is "has-a" relationship among objects (white diamond) For example, Person 'has-a' …
UML aggregation vs association - Stack Overflow
WEBMar 10, 2012 — Aggregation relationship: A class contains another class. But if the container(ClassRoom) is destroyed, the contained(Chair) is not. Actually the ClassRoom …
composition and aggregation in python - Stack Overflow
WEBNov 8, 2013 — Composition and aggregation are specialised form of Association. Whereas Association is a relationship between two classes without any rules. Composition. In …
python - When to use association, aggregation, composition and ...
WEBAggregation. Class B forms an aggregation relationship with Class A, as it references an independent A object when initialized, as one of its attributes. Whilst a B object is …
MongoDB get executionStats for aggregate query - Stack Overflow
WEBOct 7, 2016 — From MonogoDB version 3.5.5, executionStats and allPlansExecution modes are supported in explain method with aggregation. …
Aggregation in class diagram and class properties - Stack Overflow
WEBFor a Composite Aggregation (also called Composition), USUALLY this indicates a parent-child relationship. In your example, an Elevator object in your code would contain a …
design patterns - What's an Aggregate Root? - Stack Overflow
WEBAn AGGREGATE is a cluster of associated objects that we treat as a unit for the purpose of data changes. Each AGGREGATE has a root and a boundary. The boundary defines …
UML - association or aggregation (simple code snippets)
WEBFeb 28, 2015 — In the UML, aggregation and composition are defined as special forms of associations with the intended meaning of classifying part-whole-relationships. In the …
How to use $hint in MongoDB aggregation query? - Stack Overflow
WEBJul 26, 2015 — From the documentation, you can add hint with aggregation in the following manner: db.collection.aggregate(pipeline, {hint: "index_name"}) If you want to see …
uml - Difference between association and dependency ... - Stack …
WEBMar 13, 2011 — An association almost always implies that one object has the other object as a field/property/attribute (terminology differs). A dependency typically (but not always) …
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