feat(streaming): Streaming CSV uploads for over 100k records for constant memory usage (#35478)

superset-frontend/src/explore/exploreUtils/index.js

@@ -248,6 +248,7 @@ export const exportChart = async ({
   resultType = 'full',
   force = false,
   ownState = {},
+  onStartStreamingExport = null,
 }) => {
   let url;
   let payload;
@@ -272,7 +273,18 @@ export const exportChart = async ({
     });
   }
 
-  SupersetClient.postForm(url, { form_data: safeStringify(payload) });
+  // Check if streaming export handler is provided (from dashboard Chart.jsx)
+  if (onStartStreamingExport) {
+    // Streaming is handled by the caller - pass URL, payload, and export type
+    onStartStreamingExport({
+      url,
+      payload,
+      exportType: resultFormat,
+    });
+  } else {
+    // Fallback to original behavior for non-streaming exports
+    SupersetClient.postForm(url, { form_data: safeStringify(payload) });
+  }
 };
 
 export const exploreChart = (formData, requestParams) => {