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bigquery_relax_column_query_append.go
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bigquery_relax_column_query_append.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 querying
// [START bigquery_relax_column_query_append]
import (
"context"
"fmt"
"cloud.google.com/go/bigquery"
)
// relaxTableQuery demonstrates relaxing the schema of a table by appending query results to
// enable the table to allow NULL values.
func relaxTableQuery(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()
sampleSchema := bigquery.Schema{
{Name: "full_name", Type: bigquery.StringFieldType, Required: true},
{Name: "age", Type: bigquery.IntegerFieldType, Required: true},
}
meta := &bigquery.TableMetadata{
Schema: sampleSchema,
}
tableRef := client.Dataset(datasetID).Table(tableID)
if err := tableRef.Create(ctx, meta); err != nil {
return err
}
// Now, append a query result that includes nulls, but allow the job to relax
// all required columns.
q := client.Query("SELECT \"Beyonce\" as full_name")
q.QueryConfig.Dst = client.Dataset(datasetID).Table(tableID)
q.SchemaUpdateOptions = []string{"ALLOW_FIELD_RELAXATION"}
q.WriteDisposition = bigquery.WriteAppend
q.Location = "US"
job, err := q.Run(ctx)
if err != nil {
return err
}
_, err = job.Wait(ctx)
if err != nil {
return err
}
return nil
}
// [END bigquery_relax_column_query_append]