Explain the weirdness with enriched view FieldType.AI columns in a comment for the next person to stumble on this.

packages/server/src/sdk/app/views/index.ts

@@ -432,6 +432,21 @@ export async function enrichSchema(
       ...tableSchema[key],
       ...ui,
       order: anyViewOrder ? ui?.order ?? undefined : tableSchema[key]?.order,
+      // When this was written, the only column types in FieldSchema to have columns
+      // field were the relationship columns. We blank this out here to make sure it's
+      // not set on non-relationship columns, then below we populate it by calling
+      // populateRelSchema.
+      //
+      // For Budibase 3.0 we introduced the FieldType.AI fields. Some of these fields
+      // have `columns: string[]` and it flew under the radar here because the
+      // AIFieldMetadata type isn't a union on its subtypes, it has a collection of
+      // optional fields. So columns is `columns?: string[]` which allows undefined,
+      // and doesn't fail this type check.
+      //
+      // What this means in practice is when FieldType.AI fields get enriched, we
+      // delete their `columns`. At the time of writing, I don't believe anything in
+      // the frontend depends on this, but it is odd and will probably bite us at
+      // some point.
       columns: undefined,
     }