Question

我尝试使用parquetjs： https://www.npmjs.com/package/parquetjs

示例代码：

var parquet = require('parquetjs');

// declare a schema for the `fruits` table
var schema = new parquet.ParquetSchema({
  name: { type: 'UTF8' },
  quantity: { type: 'INT64' },
  price: { type: 'DOUBLE' },
  date: { type: 'TIMESTAMP_MILLIS' },
  in_stock: { type: 'BOOLEAN' }
});

// create new ParquetWriter that writes to 'fruits.parquet'
var writer = await parquet.ParquetWriter.openFile(schema, 'fruits.parquet');

// append a few rows to the file
await writer.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await writer.appendRow({name: 'oranges', quantity: 10, price: 2.5, date: new Date(), in_stock: true});

错误： SyntaxError: await is only valid in async function

应该是什么问题（因为他们将其发布为示例）？

Answer 1

SyntaxError: await is only valid in async function

这意味着您只能在函数签名中具有await关键字的函数中使用async关键字。

为快速解决，您可以使用async IIFE。

(async() => {
    // create new ParquetWriter that writes to 'fruits.parquet'
    var writer = await parquet.ParquetWriter.openFile(schema, 'fruits.parquet');

    // append a few rows to the file
    await writer.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
    await writer.appendRow({name: 'oranges', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
})()

如何解决Parquetjs库问题-异步错误？

1 个答案: