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  1. Drivers
  2. DRIVERS-776

Support 'let' option for aggregate command

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Details

    • Spec Change
    • Status: Closed
    • Major - P3
    • Resolution: Done
    • None
    • CRUD
    • None
    • Needed
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      Added let parameters to the aggregate command.

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      Added let parameters to the aggregate command.

    Description

      Downstream Change Summary

      Drivers should add a new let option to aggregate helper methods and sync CRUD unified spec tests with mongodb/specifications@3a58fc6.

      For MongoDB 5.0+, the aggregate command accepts a let option of type object. This object consists of any amount of parameter names each followed by definitions of constants in the MQL Aggregate Expression language. Each parameter name is then usable to access the value of the corresponding MQL Expression with the "$$" syntax within Aggregate Expression contexts which may require the use of $expr or a pipeline.

      Note: this ticket only pertains to changes for aggregate. Support for let in other commands (involving pipelines or $expr) will be handled by DRIVERS-1788.

      Description of Linked Ticket

      Epic Summary

      Summary

      Deprecate the MR command and ensure its functionality is fully supported by Agg. The backend of the command has already been replaced by “MapReduce in Agg” (PM-776), we need to make sure all necessary concepts can be expressed in MQL.

      Motivation

      One objective of the query team is to consolidate dialects of all existing query commands into a single language. This project enables users to write their MR tasks directly in Agg, which provides a more capable and clear syntax. We want to move users away from legacy ways of interacting with the system. Independently, from MR jobs, some extensions are valuable for the users.

      Documentation

      Scope Document
      Technical Design Document

      Attachments

        Issue Links

          depends on

          Bug - A problem which impairs or prevents the functions of the product. SERVER-57403 Serialization error in let variables in a sharded cluster

          • Major - P3 - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. SERVER-46707 Support 'let' variables in aggregate command in sharded deployments

          • Major - P3 - Major loss of function.
          • Closed

          Task - A task that needs to be done. SERVER-46115 Implement 'let' parameters to aggregate commands

          • Major - P3 - Major loss of function.
          • Closed

          Task - A task that needs to be done. SERVER-46998 Support 'let' variables used within $merge custom pipeline update

          • Major - P3 - Major loss of function.
          • Closed
          split to

          New Feature - A new feature of the product, which has yet to be developed. JAVA-4186 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. PHPLIB-663 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. RUST-836 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. CDRIVER-4010 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. CSHARP-3700 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. CXX-2274 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. GODRIVER-2033 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. MOTOR-745 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. NODE-3325 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. PYTHON-2741 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. RUBY-2659 Support 'let' option for aggregate command

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. NODE-3353 Test for aggregate $out stage using the let option

          • Unknown - Priority not determined yet.
          • Closed

          Activity

            People

              jmikola@mongodb.com Jeremy Mikola
              backlog-server-pm Backlog - Core Eng Program Management Team
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              Dates

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                Updated:
                Resolved: