import (
"context"
"fmt"
"cloud.google.com/go/bigquery"
)
// createTableFromTemplateTable demonstrates how to use the properties of one
// table (schema, partitioning, clustering) to create a new empty table with
// the same configuration.
func createTableFromTemplateTable(srcProjectID, srcDatasetID, srcTableID, dstProjectID, dstDatasetID, dstTableID string) error {
// srcProjectID := "bigquery-public-data"
// srcDatasetID := "samples"
// srcTableID := "shakespeare"
// dstProjectID := "my-project-id"
// dstDatasetID := "mydataset"
// dstTableID := "mytable"
ctx := context.Background()
// We'll construct the client based on the destination project.
client, err := bigquery.NewClient(ctx, dstProjectID)
if err != nil {
return fmt.Errorf("bigquery.NewClient: %v", err)
}
defer client.Close()
srcTableRef := client.DatasetInProject(srcProjectID, srcDatasetID).Table(srcTableID)
srcMeta, err := srcTableRef.Metadata(ctx)
if err != nil {
return fmt.Errorf("failed to get source table metadata: %v", err)
}
dstTableRef := client.Dataset(dstDatasetID).Table(dstTableID)
// We'll use some (but not all) of the metadata from the source table
// to define the destination table. Other properties to consider include
// attributes like expiration policy and managed encryption settings.
dstMeta := &bigquery.TableMetadata{
Description: fmt.Sprintf("table structure copied from %s.%s.%s",
srcTableRef.ProjectID, srcTableRef.DatasetID, srcTableRef.TableID),
Schema: srcMeta.Schema,
Clustering: srcMeta.Clustering,
// A table will only have one partitioning configuration, the others will be empty/nil.
TimePartitioning: srcMeta.TimePartitioning,
RangePartitioning: srcMeta.RangePartitioning,
// Retain the same enforcement of partition filtering as well.
RequirePartitionFilter: srcMeta.RequirePartitionFilter,
}
if err := dstTableRef.Create(ctx, dstMeta); err != nil {
return err
}
return nil
}
