BigQuery API - Class Google::Cloud::Bigquery::External::BigtableSource::Column (v1.41.0)

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

BigtableSource::Column

A Bigtable column to expose in the table schema along with its types.

Inherits

  • Object

Example

require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.rowkey_as_string = true
  bt.add_family "user" do |u|
    u.add_string "name"
    u.add_string "email"
    u.add_integer "age"
    u.add_boolean "active"
  end
end

data = bigquery.query "SELECT * FROM my_ext_table",
                      external: { my_ext_table: bigtable_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?

Methods

#encoding

def encoding() -> String

The encoding of the values when the type is not STRING.

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

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_bytes "name" do |col|
      col.encoding = "TEXT"
      col.encoding # "TEXT"
    end
  end
end

#encoding=

def encoding=(new_encoding)

Set the encoding of the values when the type is not STRING. Acceptable encoding values are:

  • TEXT - indicates values are alphanumeric text strings.
  • BINARY - indicates values are encoded using HBase Bytes.toBytes family of functions. This can be overridden on a column.
Parameter
  • new_encoding (String) — New encoding value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_bytes "name" do |col|
      col.encoding = "TEXT"
      col.encoding # "TEXT"
    end
  end
end

#field_name

def field_name() -> String

If the qualifier is not a valid BigQuery field identifier (does not match [a-zA-Z][a-zA-Z0-9_]*) a valid identifier must be provided as the column field name and is used as field name in queries.

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

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "001_name", as: "user" do |col|
      col.field_name # "user"
      col.field_name = "User"
      col.field_name # "User"
    end
  end
end

#field_name=

def field_name=(new_field_name)

Sets the identifier to be used as the column field name in queries when the qualifier is not a valid BigQuery field identifier (does not match [a-zA-Z][a-zA-Z0-9_]*).

Parameter
  • new_field_name (String) — New field_name value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "001_name", as: "user" do |col|
      col.field_name # "user"
      col.field_name = "User"
      col.field_name # "User"
    end
  end
end

#latest

def latest() -> Boolean

Whether only the latest version of value in this column are exposed. Can also be set at the column family level. However, this value takes precedence when set at both levels.

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 do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.latest = true
      col.latest # true
    end
  end
end

#latest=

def latest=(new_latest)

Set whether only the latest version of value in this column are exposed. Can also be set at the column family level. However, this value takes precedence when set at both levels.

Parameter
  • new_latest (Boolean) — New latest value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.latest = true
      col.latest # true
    end
  end
end

#qualifier

def qualifier() -> String

Qualifier of the column. Columns in the parent column family that has this exact qualifier are exposed as . field. If the qualifier is valid UTF-8 string, it will be represented as a UTF-8 string. Otherwise, it will represented as a ASCII-8BIT string.

If the qualifier is not a valid BigQuery field identifier (does not match [a-zA-Z][a-zA-Z0-9_]*) a valid identifier must be provided as field_name.

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

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.qualifier # "user"
      col.qualifier = "User"
      col.qualifier # "User"
    end
  end
end

#qualifier=

def qualifier=(new_qualifier)

Set the qualifier of the column. Columns in the parent column family that has this exact qualifier are exposed as . field. Values that are valid UTF-8 strings will be treated as such. All other values will be treated as BINARY.

Parameter
  • new_qualifier (String) — New qualifier value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.qualifier # "user"
      col.qualifier = "User"
      col.qualifier # "User"
    end
  end
end

#type

def type() -> String

The type to convert the value in cells of this column. The values are expected to be encoded using HBase Bytes.toBytes function when using the BINARY encoding value. The following BigQuery types are allowed:

  • BYTES
  • STRING
  • INTEGER
  • FLOAT
  • BOOLEAN

Default type is BYTES. Can also be set at the column family level. However, this value takes precedence when set at both levels.

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

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.type # "STRING"
    end
  end
end

#type=

def type=(new_type)

Set the type to convert the value in cells of this column. The values are expected to be encoded using HBase Bytes.toBytes function when using the BINARY encoding value. The following BigQuery types are allowed:

  • BYTES
  • STRING
  • INTEGER
  • FLOAT
  • BOOLEAN

Default type is BYTES. Can also be set at the column family level. However, this value takes precedence when set at both levels.

Parameter
  • new_type (String) — New type value
Example 
require "google/cloud/bigquery"

bigquery = Google::Cloud::Bigquery.new

bigtable_url = "https://googleapis.com/bigtable/projects/..."
bigtable_table = bigquery.external bigtable_url do |bt|
  bt.add_family "user" do |u|
    u.add_string "name" do |col|
      col.type # "STRING"
      col.type = "BYTES"
      col.type # "BYTES"
    end
  end
end