Generalised the fix as not all calculations will have a groupby per PR feedback

packages/builder/src/components/backend/DataTable/Table.svelte

@@ -28,7 +28,9 @@
 
   $: if (schema) {
     parsedSchema = Object.keys(schema).reduce((acc, key) => {
-      acc[key] = { ...schema[key] }
+      acc[key] =
+        typeof schema[key] === "string" ? { type: schema[key] } : schema[key]
+
       if (!canBeSortColumn(acc[key].type)) {
         acc[key].sortable = false
       }

packages/builder/src/components/backend/DataTable/ViewDataTable.svelte

@@ -19,21 +19,8 @@
   let loading = false
   let type = "internal"
 
-  // Grouped views have a fixed schema layout
-  const parseSchema = view => {
-    if (!view.groupBy) {
-      return view.schema
-    }
-    const { group, field, value } = view.schema
-    return {
-      group,
-      field: { type: field },
-      value: { type: value },
-    }
-  }
-
   $: name = view.name
-  $: schema = parseSchema(view)
+  $: schema = view.schema
   $: calculation = view.calculation
 
   $: supportedFormats = Object.values(ROW_EXPORT_FORMATS).filter(key => {