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 The backend of the command has already been replaced by “MapReduce in Agg” (PM-776), we need to make sure all necessary concepts can be expressed in MQL.
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.
Technical Design Document