diff --git a/packages/grafana-data/src/dataframe/MutableDataFrame.ts b/packages/grafana-data/src/dataframe/MutableDataFrame.ts
index 77abfa58204..94c8a599cde 100644
--- a/packages/grafana-data/src/dataframe/MutableDataFrame.ts
+++ b/packages/grafana-data/src/dataframe/MutableDataFrame.ts
@@ -7,6 +7,7 @@ import { FunctionalVector } from '../vector/FunctionalVector';
 
 import { guessFieldTypeFromValue, guessFieldTypeForField, toDataFrameDTO } from './processDataFrame';
 
+/** @deprecated */
 export type MutableField<T = any> = Field<T>;
 
 type MutableVectorCreator = (buffer?: any[]) => any[];
@@ -65,14 +66,14 @@ export class MutableDataFrame<T = any> extends FunctionalVector<T> implements Da
     return this.first.length;
   }
 
-  addFieldFor(value: unknown, name?: string): MutableField {
+  addFieldFor(value: unknown, name?: string): Field {
     return this.addField({
       name: name || '', // Will be filled in
       type: guessFieldTypeFromValue(value),
     });
   }
 
-  addField(f: Field | FieldDTO, startLength?: number): MutableField {
+  addField(f: Field | FieldDTO, startLength?: number): Field {
     let buffer: any[] | undefined = undefined;
 
     if (f.values) {
@@ -98,7 +99,7 @@ export class MutableDataFrame<T = any> extends FunctionalVector<T> implements Da
       name = `Field ${this.fields.length + 1}`;
     }
 
-    const field: MutableField = {
+    const field: Field = {
       ...f,
       name,
       type,
diff --git a/packages/grafana-data/src/transformations/transformers/groupBy.ts b/packages/grafana-data/src/transformations/transformers/groupBy.ts
index 03f24ff68b6..5f990c59ec0 100644
--- a/packages/grafana-data/src/transformations/transformers/groupBy.ts
+++ b/packages/grafana-data/src/transformations/transformers/groupBy.ts
@@ -1,6 +1,5 @@
 import { map } from 'rxjs/operators';
 
-import { MutableField } from '../../dataframe/MutableDataFrame';
 import { guessFieldTypeForField } from '../../dataframe/processDataFrame';
 import { getFieldDisplayName } from '../../field/fieldState';
 import { DataFrame, Field, FieldType } from '../../types/dataFrame';
@@ -63,7 +62,7 @@ export const groupByTransformer: DataTransformerInfo<GroupByTransformerOptions>
 
           // Group the values by fields and groups so we can get all values for a
           // group for a given field.
-          const valuesByGroupKey = new Map<string, Record<string, MutableField>>();
+          const valuesByGroupKey = new Map<string, Record<string, Field>>();
           for (let rowIndex = 0; rowIndex < frame.length; rowIndex++) {
             const groupKey = String(groupByFields.map((field) => field.values[rowIndex]));
             const valuesByField = valuesByGroupKey.get(groupKey) ?? {};
diff --git a/public/app/plugins/datasource/prometheus/result_transformer.ts b/public/app/plugins/datasource/prometheus/result_transformer.ts
index 19e63367190..f430483e8c8 100644
--- a/public/app/plugins/datasource/prometheus/result_transformer.ts
+++ b/public/app/plugins/datasource/prometheus/result_transformer.ts
@@ -15,7 +15,6 @@ import {
   formatLabels,
   getDisplayProcessor,
   Labels,
-  MutableField,
   PreferredVisualisationType,
   ScopedVars,
   TIME_SERIES_TIME_FIELD_NAME,
@@ -208,7 +207,7 @@ export function transformDFToTable(dfs: DataFrame[]): DataFrame[] {
     const valueText = getValueText(refIds.length, refId);
     const valueField = getValueField({ data: [], valueName: valueText });
     const timeField = getTimeField([]);
-    const labelFields: MutableField[] = [];
+    const labelFields: Field[] = [];
 
     // Fill labelsFields with labels from dataFrames
     dataFramesByRefId[refId].forEach((df) => {
@@ -329,14 +328,13 @@ export function transform(
 
   // Return early if result type is scalar
   if (prometheusResult.resultType === 'scalar') {
-    return [
-      {
-        meta: options.meta,
-        refId: options.refId,
-        length: 1,
-        fields: [getTimeField([prometheusResult.result]), getValueField({ data: [prometheusResult.result] })],
-      },
-    ];
+    const df: DataFrame = {
+      meta: options.meta,
+      refId: options.refId,
+      length: 1,
+      fields: [getTimeField([prometheusResult.result]), getValueField({ data: [prometheusResult.result] })],
+    };
+    return [df];
   }
 
   // Return early again if the format is table, this needs special transformation.
@@ -556,7 +554,7 @@ function getLabelValue(metric: PromMetric, label: string): string | number {
   return '';
 }
 
-function getTimeField(data: PromValue[], isMs = false): MutableField {
+function getTimeField(data: PromValue[], isMs = false): Field<number> {
   return {
     name: TIME_SERIES_TIME_FIELD_NAME,
     type: FieldType.time,
@@ -579,7 +577,7 @@ function getValueField({
   parseValue = true,
   labels,
   displayNameFromDS,
-}: ValueFieldOptions): MutableField {
+}: ValueFieldOptions): Field {
   return {
     name: valueName,
     type: FieldType.number,
diff --git a/public/app/plugins/panel/datagrid/components/DatagridContextMenu.tsx b/public/app/plugins/panel/datagrid/components/DatagridContextMenu.tsx
index 2189a3a1693..648fbd45160 100644
--- a/public/app/plugins/panel/datagrid/components/DatagridContextMenu.tsx
+++ b/public/app/plugins/panel/datagrid/components/DatagridContextMenu.tsx
@@ -2,7 +2,7 @@ import { GridSelection } from '@glideapps/glide-data-grid';
 import { capitalize } from 'lodash';
 import React from 'react';
 
-import { ArrayVector, DataFrame, FieldType } from '@grafana/data';
+import { DataFrame, FieldType } from '@grafana/data';
 import { convertFieldType } from '@grafana/data/src/transformations/transformers/convertFieldType';
 import { ContextMenu, MenuGroup, MenuItem } from '@grafana/ui';
 import { MenuDivider } from '@grafana/ui/src/components/Menu/MenuDivider';
@@ -111,8 +111,7 @@ export const DatagridContextMenu = ({
           label="Clear column"
           onClick={() => {
             const field = data.fields[column];
-            field.values = new ArrayVector(field.values.toArray().map(() => null));
-
+            field.values = field.values.map(() => null);
             saveData({
               ...data,
             });