Function readParquet

Read a Parquet file into Arrow data.

This returns an Arrow table in WebAssembly memory. To transfer the Arrow table to JavaScript memory you have two options:

• (Easier): Call Table.intoIPCStream to construct a buffer that can be parsed with Arrow JS's tableFromIPC function.
• (More performant but bleeding edge): Call Table.intoFFI to construct a data representation that can be parsed zero-copy from WebAssembly with arrow-js-ffi using parseTable.

Example with IPC stream:

import { tableFromIPC } from "apache-arrow";
import initWasm, {readParquet} from "parquet-wasm";

// Instantiate the WebAssembly context
await initWasm();

const resp = await fetch("https://example.com/file.parquet");
const parquetUint8Array = new Uint8Array(await resp.arrayBuffer());
const arrowWasmTable = readParquet(parquetUint8Array);
const arrowTable = tableFromIPC(arrowWasmTable.intoIPCStream());
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Example with arrow-js-ffi:

import { parseTable } from "arrow-js-ffi";
import initWasm, {readParquet, wasmMemory} from "parquet-wasm";

// Instantiate the WebAssembly context
await initWasm();
const WASM_MEMORY = wasmMemory();

const resp = await fetch("https://example.com/file.parquet");
const parquetUint8Array = new Uint8Array(await resp.arrayBuffer());
const arrowWasmTable = readParquet(parquetUint8Array);
const ffiTable = arrowWasmTable.intoFFI();
const arrowTable = parseTable(
  WASM_MEMORY.buffer,
  ffiTable.arrayAddrs(),
  ffiTable.schemaAddr()
);
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