adds dimensionName to datatable column meta information

src/plugins/expressions/common/expression_types/specs/datatable.ts

@@ -69,6 +69,10 @@ export interface DatatableColumnMeta {
    * index/table this column is based on
    */
   index?: string;
+  /**
+   * names the domain this column represents
+   */
+  dimensionName?: string;
   /**
    * serialized field format
    */

src/plugins/vis_type_pie/public/pie_fn.ts

@@ -9,6 +9,7 @@
 import { i18n } from '@kbn/i18n';
 import { ExpressionFunctionDefinition, Datatable, Render } from '../../expressions/public';
 import { PieVisParams, PieVisConfig } from './types';
+import { prepareLogTable } from '../../visualizations/common';
 
 export const vislibPieName = 'pie_vis';
 
@@ -133,7 +134,33 @@ export const createPieVisFn = (): VisTypePieExpressionFunctionDefinition => ({
     } as PieVisParams;
 
     if (handlers?.inspectorAdapters?.tables) {
-      handlers.inspectorAdapters.tables.logDatatable('default', context);
+      const logTable = prepareLogTable(context, [
+        [
+          [args.metric],
+          i18n.translate('visTypePie.function.args.labelsHelpText', {
+            defaultMessage: 'Slice size',
+          }),
+        ],
+        [
+          args.buckets,
+          i18n.translate('visTypePie.function.args.labelsHelpText', {
+            defaultMessage: 'Slice',
+          }),
+        ],
+        [
+          args.splitColumn,
+          i18n.translate('visTypePie.function.args.labelsHelpText', {
+            defaultMessage: 'Column Split',
+          }),
+        ],
+        [
+          args.splitRow,
+          i18n.translate('visTypePie.function.args.labelsHelpText', {
+            defaultMessage: 'Row Split',
+          }),
+        ],
+      ]);
+      handlers.inspectorAdapters.tables.logDatatable('default', logTable);
     }
 
     return {

src/plugins/visualizations/public/expression_functions/range.ts → src/plugins/visualizations/common/expression_functions/range.ts

@@ -7,7 +7,7 @@
  */
 
 import { i18n } from '@kbn/i18n';
-import { ExpressionFunctionDefinition, Datatable, Range } from '../../../expressions/public';
+import { ExpressionFunctionDefinition, Datatable, Range } from '../../../expressions/common';
 
 interface Arguments {
   from: number;

src/plugins/visualizations/public/expression_functions/vis_dimension.ts → src/plugins/visualizations/common/expression_functions/vis_dimension.ts

@@ -12,7 +12,7 @@ import {
   ExpressionValueBoxed,
   Datatable,
   DatatableColumn,
-} from '../../../expressions/public';
+} from '../../../expressions/common';
 
 interface Arguments {
   accessor: string | number;

src/plugins/visualizations/common/index.ts

@@ -8,3 +8,4 @@
 
 /** @public types */
 export * from './types';
+export * from './prepare_log_table';

src/plugins/visualizations/common/prepare_log_table.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { ExpressionValueVisDimension } from './expression_functions/vis_dimension';
+import { Datatable } from '../../expressions/common/expression_types/specs';
+
+export type Dimension = [ExpressionValueVisDimension[] | undefined, string];
+
+const getDimensionName = (columnIndex: number, dimensions: Dimension[]) => {
+  for (const dimension of dimensions) {
+    if (dimension[0]?.find((d) => d.accessor === columnIndex)) {
+      return dimension[1];
+    }
+  }
+};
+
+export const prepareLogTable = (datatable: Datatable, dimensions: Dimension[]) => {
+  return {
+    ...datatable,
+    columns: datatable.columns.map((column, columnIndex) => {
+      return {
+        ...column,
+        meta: {
+          ...column.meta,
+          dimensionName: getDimensionName(columnIndex, dimensions),
+        },
+      };
+    }),
+  };
+};

src/plugins/visualizations/public/plugin.ts

@@ -31,8 +31,8 @@ import {
   createVisEmbeddableFromObject,
 } from './embeddable';
 import { TypesService } from './vis_types/types_service';
-import { range as rangeExpressionFunction } from './expression_functions/range';
-import { visDimension as visDimensionExpressionFunction } from './expression_functions/vis_dimension';
+import { range as rangeExpressionFunction } from '../common/expression_functions/range';
+import { visDimension as visDimensionExpressionFunction } from '../common/expression_functions/vis_dimension';
 
 import { createStartServicesGetter, StartServicesGetter } from '../../kibana_utils/public';
 import { createSavedVisLoader, SavedVisualizationsLoader } from './saved_visualizations';