BigQuery API - Class Google::Cloud::Bigquery::External::DataSource (v1.39.0)

Reference documentation and code samples for the BigQuery API class Google::Cloud::Bigquery::External::DataSource.

DataSource

External::DataSource and its subclasses represents an external data source that can be queried from directly, even though the data is not stored in BigQuery. Instead of loading or streaming the data, this object references the external data source.

The AVRO and Datastore Backup formats use DataSource. See CsvSource, JsonSource, SheetsSource, BigtableSource for the other formats.

Inherits

  • Object

Examples

require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

avro_url = "gs://bucket/path/to/*.avro"
avro_table = bigquery.external avro_url do |avro|
  avro.autodetect = true
end

data = bigquery.query "SELECT * FROM my_ext_table",
                      external: { my_ext_table: avro_table }

# Iterate over the first page of results
data.each do |row|
  puts row[:name]
end
# Retrieve the next page of results
data = data.next if data.next?

Hive partitioning options:

require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

Methods

#autodetect

def autodetect() -> Boolean

Indicates if the schema and format options are detected automatically.

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.autodetect = true
end

csv_table.autodetect #=> true

#autodetect=

def autodetect=(new_autodetect)

Set whether to detect schema and format options automatically. Any option specified explicitly will be honored.

Parameter
  • new_autodetect (Boolean) — New autodetect value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.autodetect = true
end

csv_table.autodetect #=> true

#avro?

def avro?() -> Boolean

Whether the data format is "AVRO".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

avro_url = "gs://bucket/path/to/*.avro"
avro_table = bigquery.external avro_url

avro_table.format #=> "AVRO"
avro_table.avro? #=> true

#backup?

def backup?() -> Boolean

Whether the data format is "DATASTORE_BACKUP".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

backup_url = "gs://bucket/path/to/data.backup_info"
backup_table = bigquery.external backup_url

backup_table.format #=> "DATASTORE_BACKUP"
backup_table.backup? #=> true

#bigtable?

def bigtable?() -> Boolean

Whether the data format is "BIGTABLE".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url

bigtable_table.format #=> "BIGTABLE"
bigtable_table.bigtable? #=> true

#compression

def compression() -> String

The compression type of the data source. Possible values include "GZIP" and nil. The default value is nil. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats. Optional.

Returns
  • (String)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.compression = "GZIP"
end

csv_table.compression #=> "GZIP"

#compression=

def compression=(new_compression)

Set the compression type of the data source. Possible values include "GZIP" and nil. The default value is nil. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats. Optional.

Parameter
  • new_compression (String) — New compression value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.compression = "GZIP"
end

csv_table.compression #=> "GZIP"

#csv?

def csv?() -> Boolean

Whether the data format is "CSV".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url

csv_table.format #=> "CSV"
csv_table.csv? #=> true

#format

def format() -> String

The data format. For CSV files, specify "CSV". For Google sheets, specify "GOOGLE_SHEETS". For newline-delimited JSON, specify "NEWLINE_DELIMITED_JSON". For Avro files, specify "AVRO". For Google Cloud Datastore backups, specify "DATASTORE_BACKUP". [Beta] For Google Cloud Bigtable, specify "BIGTABLE".

Returns
  • (String)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url

csv_table.format #=> "CSV"

#hive_partitioning?

def hive_partitioning?() -> Boolean

Checks if hive partitioning options are set.

Not all storage formats support hive partitioning. Requesting hive partitioning on an unsupported format will lead to an error. Currently supported types include: avro, csv, json, orc and parquet. If your data is stored in ORC or Parquet on Cloud Storage, see Querying columnar formats on Cloud Storage.

Returns
  • (Boolean) — true when hive partitioning options are set, or false otherwise.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_mode

def hive_partitioning_mode() -> String, nil

The mode of hive partitioning to use when reading data. The following modes are supported:

  1. AUTO: automatically infer partition key name(s) and type(s).
  2. STRINGS: automatically infer partition key name(s). All types are interpreted as strings.
  3. CUSTOM: partition key schema is encoded in the source URI prefix.
Returns
  • (String, nil) — The mode of hive partitioning, or nil if not set.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_mode=

def hive_partitioning_mode=(mode)

Sets the mode of hive partitioning to use when reading data. The following modes are supported:

  1. auto: automatically infer partition key name(s) and type(s).
  2. strings: automatically infer partition key name(s). All types are interpreted as strings.
  3. custom: partition key schema is encoded in the source URI prefix.

Not all storage formats support hive partitioning. Requesting hive partitioning on an unsupported format will lead to an error. Currently supported types include: avro, csv, json, orc and parquet. If your data is stored in ORC or Parquet on Cloud Storage, see Querying columnar formats on Cloud Storage.

See #format, #hive_partitioning_require_partition_filter= and #hive_partitioning_source_uri_prefix=.

Parameter
  • mode (String, Symbol) — The mode of hive partitioning to use when reading data.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_require_partition_filter=

def hive_partitioning_require_partition_filter=(require_partition_filter)

Sets whether queries over the table using this external data source require a partition filter that can be used for partition elimination to be specified.

See #format, #hive_partitioning_mode= and #hive_partitioning_source_uri_prefix=.

Parameter
  • require_partition_filter (Boolean) — true if a partition filter must be specified, false otherwise.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_require_partition_filter?

def hive_partitioning_require_partition_filter?() -> Boolean

Whether queries over the table using this external data source require a partition filter that can be used for partition elimination to be specified. Note that this field should only be true when creating a permanent external table or querying a temporary external table.

Returns
  • (Boolean) — true when queries over this table require a partition filter, or false otherwise.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_source_uri_prefix

def hive_partitioning_source_uri_prefix() -> String, nil

The common prefix for all source uris when hive partition detection is requested. The prefix must end immediately before the partition key encoding begins. For example, consider files following this data layout:

gs://bucket/path_to_table/dt=2019-01-01/country=BR/id=7/file.avro gs://bucket/path_to_table/dt=2018-12-31/country=CA/id=3/file.avro

When hive partitioning is requested with either AUTO or STRINGS mode, the common prefix can be either of gs://bucket/path_to_table or gs://bucket/path_to_table/ (trailing slash does not matter).

Returns
  • (String, nil) — The common prefix for all source uris, or nil if not set.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#hive_partitioning_source_uri_prefix=

def hive_partitioning_source_uri_prefix=(source_uri_prefix)

Sets the common prefix for all source uris when hive partition detection is requested. The prefix must end immediately before the partition key encoding begins. For example, consider files following this data layout:

gs://bucket/path_to_table/dt=2019-01-01/country=BR/id=7/file.avro gs://bucket/path_to_table/dt=2018-12-31/country=CA/id=3/file.avro

When hive partitioning is requested with either AUTO or STRINGS mode, the common prefix can be either of gs://bucket/path_to_table or gs://bucket/path_to_table/ (trailing slash does not matter).

See #format, #hive_partitioning_mode= and #hive_partitioning_require_partition_filter=.

Parameter
  • source_uri_prefix (String) — The common prefix for all source uris.
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_require_partition_filter = true
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end

external_data.hive_partitioning? #=> true
external_data.hive_partitioning_mode #=> "AUTO"
external_data.hive_partitioning_require_partition_filter? #=> true
external_data.hive_partitioning_source_uri_prefix #=> source_uri_prefix

#ignore_unknown

def ignore_unknown() -> Boolean

Indicates if BigQuery should allow extra values that are not represented in the table schema. If true, the extra values are ignored. If false, records with extra columns are treated as bad records, and if there are too many bad records, an invalid error is returned in the job result. The default value is false.

BigQuery treats trailing columns as an extra in CSV, named values that don't match any column names in JSON. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats. Optional.

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.ignore_unknown = true
end

csv_table.ignore_unknown #=> true

#ignore_unknown=

def ignore_unknown=(new_ignore_unknown)

Set whether BigQuery should allow extra values that are not represented in the table schema. If true, the extra values are ignored. If false, records with extra columns are treated as bad records, and if there are too many bad records, an invalid error is returned in the job result. The default value is false.

BigQuery treats trailing columns as an extra in CSV, named values that don't match any column names in JSON. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats. Optional.

Parameter
  • new_ignore_unknown (Boolean) — New ignore_unknown value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.ignore_unknown = true
end

csv_table.ignore_unknown #=> true

#json?

def json?() -> Boolean

Whether the data format is "NEWLINE_DELIMITED_JSON".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

json_url = "gs://bucket/path/to/data.json"
json_table = bigquery.external json_url

json_table.format #=> "NEWLINE_DELIMITED_JSON"
json_table.json? #=> true

#max_bad_records

def max_bad_records() -> Integer

The maximum number of bad records that BigQuery can ignore when reading data. If the number of bad records exceeds this value, an invalid error is returned in the job result. The default value is 0, which requires that all records are valid. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats.

Returns
  • (Integer)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.max_bad_records = 10
end

csv_table.max_bad_records #=> 10

#max_bad_records=

def max_bad_records=(new_max_bad_records)

Set the maximum number of bad records that BigQuery can ignore when reading data. If the number of bad records exceeds this value, an invalid error is returned in the job result. The default value is 0, which requires that all records are valid. This setting is ignored for Google Cloud Bigtable, Google Cloud Datastore backups and Avro formats.

Parameter
  • new_max_bad_records (Integer) — New max_bad_records value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url do |csv|
  csv.max_bad_records = 10
end

csv_table.max_bad_records #=> 10

#orc?

def orc?() -> Boolean

Whether the data format is "ORC".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :orc do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end
external_data.format #=> "ORC"
external_data.orc? #=> true

#parquet?

def parquet?() -> Boolean

Whether the data format is "PARQUET".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

gcs_uri = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/*"
source_uri_prefix = "gs://cloud-samples-data/bigquery/hive-partitioning-samples/autolayout/"
external_data = bigquery.external gcs_uri, format: :parquet do |ext|
  ext.hive_partitioning_mode = :auto
  ext.hive_partitioning_source_uri_prefix = source_uri_prefix
end
external_data.format #=> "PARQUET"
external_data.parquet? #=> true

#sheets?

def sheets?() -> Boolean

Whether the data format is "GOOGLE_SHEETS".

Returns
  • (Boolean)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

sheets_url = "https://docs.google.com/spreadsheets/d/1234567980"
sheets_table = bigquery.external sheets_url

sheets_table.format #=> "GOOGLE_SHEETS"
sheets_table.sheets? #=> true

#urls

def urls() -> Array<String>

The fully-qualified URIs that point to your data in Google Cloud. For Google Cloud Storage URIs: Each URI can contain one '' wildcard character and it must come after the 'bucket' name. Size limits related to load jobs apply to external data sources. For Google Cloud Bigtable URIs: Exactly one URI can be specified and it has be a fully specified and valid HTTPS URL for a Google Cloud Bigtable table. For Google Cloud Datastore backups, exactly one URI can be specified, and it must end with '.backup_info'. Also, the '' wildcard character is not allowed.

Returns
  • (Array<String>)
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

csv_url = "gs://bucket/path/to/data.csv"
csv_table = bigquery.external csv_url

csv_table.urls #=> ["gs://bucket/path/to/data.csv"]