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bigquery_add_empty_column.go
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bigquery_add_empty_column.go
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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
//
// https://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.
package table
// [START bigquery_add_empty_column]
import (
"context"
"fmt"
"cloud.google.com/go/bigquery"
)
// updateTableAddColumn demonstrates modifying the schema of a table to append an additional column.
func updateTableAddColumn(projectID, datasetID, tableID string) error {
// projectID := "my-project-id"
// datasetID := "mydataset"
// tableID := "mytable"
ctx := context.Background()
client, err := bigquery.NewClient(ctx, projectID)
if err != nil {
return fmt.Errorf("bigquery.NewClient: %w", err)
}
defer client.Close()
tableRef := client.Dataset(datasetID).Table(tableID)
meta, err := tableRef.Metadata(ctx)
if err != nil {
return err
}
newSchema := append(meta.Schema,
&bigquery.FieldSchema{Name: "phone", Type: bigquery.StringFieldType},
)
update := bigquery.TableMetadataToUpdate{
Schema: newSchema,
}
if _, err := tableRef.Update(ctx, update, meta.ETag); err != nil {
return err
}
return nil
}
// [END bigquery_add_empty_column]