AWS documentdb documentation change
Summary
Entire documentation page for the $reduce aggregation operator has been removed, including all examples and explanations
Security assessment
The change removes general documentation about a database aggregation operator ($reduce) and its usage examples. There is no evidence of security vulnerability fixes, security patches, or security-related content in the removed material. The removal appears to be a routine documentation cleanup or restructuring without any security implications mentioned in the diff.
Diff
diff --git a/documentdb/latest/developerguide/reduce.md b/documentdb/latest/developerguide/reduce.md index 8522ea0db..8b1378917 100644 --- a//documentdb/latest/developerguide/reduce.md +++ b//documentdb/latest/developerguide/reduce.md @@ -1 +0,0 @@ -[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#reduce "Open PDF") @@ -3,153 +1,0 @@ -[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html) - -Example (MongoDB Shell)Code examples - -# $reduce - -The `$reduce` aggregation operator in Amazon DocumentDB is used to apply a function of two arguments cumulatively to the elements of an array to reduce the array to a single value. This operator is particularly useful for performing complex calculations or transformations on array data within the aggregation pipeline. - -**Parameters** - - * `input`: The array to be reduced. - - * `initialValue`: The initial value to be used in the reduction operation. - - * `in`: The expression to be evaluated on each element of the `input` array. This expression should return a value that will be used in the next iteration of the reduction. - - - - -## Example (MongoDB Shell) - -The following example demonstrates how to use the `$reduce` operator to calculate the sum of all elements in an array. - -**Create sample documents** - - - db.orders.insertMany([ - { "_id": 1, "items": [1, 2, 3, 4, 5] }, - { "_id": 2, "items": [10, 20, 30] }, - { "_id": 3, "items": [5, 15, 25, 35] }, - { "_id": 4, "items": [100, 200] } - ]) - -**Query example** - - - db.orders.aggregate([ - { - $project: { - total: { - $reduce: { - input: "$items", - initialValue: 0, - in: { $add: ["$$value", "$$this"] } - } - } - } - } - ]) - -**Output** - - - [ - { "_id": 1, "total": 15 }, - { "_id": 2, "total": 60 }, - { "_id": 3, "total": 80 }, - { "_id": 4, "total": 300 } - ] - -The `$reduce` operator iterates over the `items` array, adding each element to the `initialValue` of 0. The result is the sum of all elements in the array. - -## Code examples - -To view a code example for using the `$reduce` command, choose the tab for the language that you want to use: - -Node.js - - -Here's an example of using the `$reduce` operator in a Node.js application: - - - const { MongoClient } = require("mongodb"); - - async function main() { - const client = await MongoClient.connect("mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false"); - const db = client.db("test"); - const orders = db.collection("orders"); - - const result = await orders.aggregate([ - { - $project: { - total: { - $reduce: { - input: "$items", - initialValue: 0, - in: { $add: ["$$value", "$$this"] } - } - } - } - } - ]).toArray(); - - console.log(result); - await client.close(); - } - - main(); - -Python - - -Here's an example of using the `$reduce` operator in a python application: - - - from pymongo import MongoClient - - def main(): - client = MongoClient("mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false") - db = client["test"] - orders = db["orders"] - - result = list(orders.aggregate([ - { - "$project": { - "total": { - "$reduce": { - "input": "$items", - "initialValue": 0, - "in": { "$add": ["$$value", "$$this"] } - } - } - } - } - ])) - - print(result) - client.close() - - if __name__ == "__main__": - main() - - **Javascript is disabled or is unavailable in your browser.** - -To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions. - -[Document Conventions](/general/latest/gr/docconventions.html) - -$redact - -$regexFind - -Did this page help you? - Yes - -Thanks for letting us know we're doing a good job! - -If you've got a moment, please tell us what we did right so we can do more of it. - -Did this page help you? - No - -Thanks for letting us know this page needs work. We're sorry we let you down. - -If you've got a moment, please tell us how we can make the documentation better.