Class FFITable

Get the pointer to one ArrowArray FFI struct for a given chunk index and column index

Access the pointer to one ArrowArray struct representing one of the internal RecordBatches. This can be viewed or copied (without serialization) to an Arrow JS RecordBatch by using arrow-js-ffi. You can access the WebAssembly.Memory instance by using wasmMemory.

Example:

import * as arrow from "apache-arrow";
import { parseRecordBatch } from "arrow-js-ffi";

const wasmTable: FFITable = ...
const wasmMemory: WebAssembly.Memory = wasmMemory();

const jsBatches: arrow.RecordBatch[] = []
for (let i = 0; i < wasmTable.numBatches(); i++) {
  // Pass `true` to copy arrays across the boundary instead of creating views.
  const jsRecordBatch = parseRecordBatch(
    wasmMemory.buffer,
    wasmTable.arrayAddr(i),
    wasmTable.schemaAddr(),
    true
  );
  jsBatches.push(jsRecordBatch);
}
const jsTable = new arrow.Table(jsBatches);
Copy

Get the total number of record batches in the table

Get the pointer to one ArrowSchema FFI struct