demo: pass metadata to worker

demo/App.tsx

@@ -101,7 +101,7 @@ function parquetDataFrame(from: AsyncBufferFrom, metadata: FileMetaData): DataFr
      */
     rows(rowStart, rowEnd, orderBy) {
       console.log(`reading rows ${rowStart}-${rowEnd}`, orderBy)
-      return parquetQueryWorker({ asyncBuffer: from, rowStart, rowEnd, orderBy })
+      return parquetQueryWorker({ asyncBuffer: from, metadata, rowStart, rowEnd, orderBy })
     },
     sortable: true,
   }

demo/workers/parquetWorkerClient.ts

@@ -60,7 +60,7 @@ export async function asyncBufferFrom(from: AsyncBufferFrom): Promise<AsyncBuffe
   const key = JSON.stringify(from)
   const cached = cache.get(key)
   if (cached) return cached
-  const asyncBuffer = 'url' in from ? asyncBufferFromUrl(from.url) : from.file.arrayBuffer()
+  const asyncBuffer = 'url' in from ? asyncBufferFromUrl(from.url, from.byteLength) : from.file.arrayBuffer()
   cache.set(key, asyncBuffer.then(cachedAsyncBuffer))
   return asyncBuffer
 }