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relaxColumn.js
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relaxColumn.js
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';
function main(
datasetId = 'my_dataset', // Existing dataset
tableId = 'my_new_table' // Table to be created
) {
// [START bigquery_relax_column]
// Import the Google Cloud client library and create a client
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
async function relaxColumn() {
/**
* Changes columns from required to nullable.
* Assumes existing table with the following schema:
* [{name: 'Name', type: 'STRING', mode: 'REQUIRED'},
* {name: 'Age', type: 'INTEGER'},
* {name: 'Weight', type: 'FLOAT'},
* {name: 'IsMagic', type: 'BOOLEAN'}];
*/
/**
* TODO(developer): Uncomment the following lines before running the sample.
*/
// const datasetId = 'my_dataset';
// const tableId = 'my_table';
const newSchema = [
{name: 'Name', type: 'STRING', mode: 'NULLABLE'},
{name: 'Age', type: 'INTEGER'},
{name: 'Weight', type: 'FLOAT'},
{name: 'IsMagic', type: 'BOOLEAN'},
];
// Retrieve current table metadata
const table = bigquery.dataset(datasetId).table(tableId);
const [metadata] = await table.getMetadata();
// Update schema
metadata.schema = newSchema;
const [apiResponse] = await table.setMetadata(metadata);
console.log(apiResponse.schema.fields);
}
// [END bigquery_relax_column]
relaxColumn();
}
main(...process.argv.slice(2));