---
title: "EngineExtension"
description: "one extension of the query engine, pinned by version and hash as a row of the release, shipped with it and never fetched at run time"
section: concepts
address: /concepts/engineextension
contract: 0476e35e6e275db5
---

# EngineExtension

one extension of the query engine, pinned by version and hash as a row of the release, shipped with it and never fetched at run time

[figure: EngineExtension is a definition at platform scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | definition |
| scope | platform |
| key | its name and the engine's version |
| store | postgres |
| family | operations |



## Fields


| field | type | required | note |
|---|---|---|---|
| `name` | `text` | yes | lakehouse, database, spatial |
| `engine_version` | `text` | yes |  |
| `version` | `text` | yes |  |
| `hash` | `hash` | yes |  |
| `release` | `id` | yes |  |
| `state` | [Readiness](/concepts/readiness) | yes | not ready when the shipped file's hash differs |



## Routes that use it
No route takes or returns EngineExtension directly. The record holds it, and the objects that point at it reach it.