fix: DH-20500: Links without operators not working (deephaven#2541) (deephaven#2542)

Cherry-pick for Grizzly

Author: mattrunyon

packages/dashboard-core-plugins/src/linker/Linker.tsx

@@ -562,7 +562,7 @@ export class Linker extends Component<LinkerProps, LinkerState> {
     // combine them so they could be set in a single call per target panel
     for (let i = 0; i < links.length; i += 1) {
       const { start, end, operator } = links[i];
-      if (start.panelId === sourceId && end != null && operator != null) {
+      if (start.panelId === sourceId && end != null) {
         const { panelId: endPanelId, columnName, columnType } = end;
         // Map of column name to column type and filter value
         const existingFilterMap = panelFilterMap.get(endPanelId);

packages/dashboard-core-plugins/src/linker/LinkerOverlayContent.tsx

@@ -10,7 +10,10 @@ import { LayoutUtils, PanelManager } from '@deephaven/dashboard';
 import Log from '@deephaven/log';
 import type { Container } from '@deephaven/golden-layout';
 import { vsGripper } from '@deephaven/icons';
-import { TypeValue as FilterTypeValue } from '@deephaven/filters';
+import {
+  type TypeValue as FilterTypeValue,
+  Type as FilterType,
+} from '@deephaven/filters';
 import clamp from 'lodash.clamp';
 import {
   isLinkableFromPanel,
@@ -308,7 +311,7 @@ export class LinkerOverlayContent extends Component<
             operator,
             startColumnType,
             type,
-          };
+          } as const;
         } catch (error) {
           log.warn('Unable to get point for link', link, error);
           return null;
@@ -345,7 +348,7 @@ export class LinkerOverlayContent extends Component<
               onClick={onLinkSelected}
               onDelete={onLinkDeleted}
               isSelected={selectedIds.has(id)}
-              operator={operator}
+              operator={operator ?? FilterType.eq}
               startColumnType={startColumnType}
               type={type}
               onOperatorChanged={this.handleOperatorChanged}

packages/dashboard-core-plugins/src/linker/LinkerUtils.ts

@@ -36,7 +36,7 @@ export type LinkColumn = {
 };
 
 export type LinkDataValue<T = unknown> = {
-  operator: FilterTypeValue;
+  operator?: FilterTypeValue; // Default behavior treats no operator as equals
   text: string;
   value: T;
   startColumnIndex: number;

packages/iris-grid/src/IrisGrid.tsx

@@ -247,7 +247,7 @@ function isEmptyConfig({
 }
 
 export type FilterData = {
-  operator: FilterTypeValue;
+  operator?: FilterTypeValue; // Default behavior treats no operator as equals
   text: string;
   value: unknown;
   startColumnIndex: number;