QueryBrew is a system-agnostic tool that optimizes SQL queries by passing them through the Umbra database optimizer and distilling the resulting execution plan back into refined SQL. Although initially mistaken for an AI wrapper by some readers, the developers clarified that the system relies on purpose-built algorithms for millisecond-level optimization and uses machine learning only for testing. The community generally views the project as a practical optimizer-as-a-service, despite some debate over using SQL as the intermediate representation.