Google BigQuery Storage v1 API - Class ReadSession (3.16.0) 

public sealed class ReadSession : IMessage<ReadSession>, IEquatable<ReadSession>, IDeepCloneable<ReadSession>, IBufferMessage, IMessage

Reference documentation and code samples for the Google BigQuery Storage v1 API class ReadSession.

Information about the ReadSession.

Inheritance

object > ReadSession

Namespace

Google.Cloud.BigQuery.Storage.V1

Assembly

Google.Cloud.BigQuery.Storage.V1.dll

Constructors

ReadSession()

public ReadSession()

ReadSession(ReadSession)

public ReadSession(ReadSession other)
Parameter
Name Description
other ReadSession

Properties

ArrowSchema

public ArrowSchema ArrowSchema { get; set; }

Output only. Arrow schema.

Property Value
Type Description
ArrowSchema

AvroSchema

public AvroSchema AvroSchema { get; set; }

Output only. Avro schema.

Property Value
Type Description
AvroSchema

DataFormat

public DataFormat DataFormat { get; set; }

Immutable. Data format of the output data. DATA_FORMAT_UNSPECIFIED not supported.

Property Value
Type Description
DataFormat

EstimatedRowCount

public long EstimatedRowCount { get; set; }

Output only. An estimate on the number of rows present in this session's streams. This estimate is based on metadata from the table which might be incomplete or stale.

Property Value
Type Description
long

EstimatedTotalBytesScanned

public long EstimatedTotalBytesScanned { get; set; }

Output only. An estimate on the number of bytes this session will scan when all streams are completely consumed. This estimate is based on metadata from the table which might be incomplete or stale.

Property Value
Type Description
long

EstimatedTotalPhysicalFileSize

public long EstimatedTotalPhysicalFileSize { get; set; }

Output only. A pre-projected estimate of the total physical size of files (in bytes) that this session will scan when all streams are consumed. This estimate is independent of the selected columns and can be based on incomplete or stale metadata from the table. This field is only set for BigLake tables.

Property Value
Type Description
long

ExpireTime

public Timestamp ExpireTime { get; set; }

Output only. Time at which the session becomes invalid. After this time, subsequent requests to read this Session will return errors. The expire_time is automatically assigned and currently cannot be specified or updated.

Property Value
Type Description
Timestamp

Name

public string Name { get; set; }

Output only. Unique identifier for the session, in the form projects/{project_id}/locations/{location}/sessions/{session_id}.

Property Value
Type Description
string

ReadOptions

public ReadSession.Types.TableReadOptions ReadOptions { get; set; }

Optional. Read options for this session (e.g. column selection, filters).

Property Value
Type Description
ReadSessionTypesTableReadOptions

ReadSessionName

public ReadSessionName ReadSessionName { get; set; }

ReadSessionName-typed view over the Name resource name property.

Property Value
Type Description
ReadSessionName

SchemaCase

public ReadSession.SchemaOneofCase SchemaCase { get; }
Property Value
Type Description
ReadSessionSchemaOneofCase

Streams

public RepeatedField<ReadStream> Streams { get; }

Output only. A list of streams created with the session.

At least one stream is created with the session. In the future, larger request_stream_count values may result in this list being unpopulated, in that case, the user will need to use a List method to get the streams instead, which is not yet available.

Property Value
Type Description
RepeatedFieldReadStream

Table

public string Table { get; set; }

Immutable. Table that this ReadSession is reading from, in the form projects/{project_id}/datasets/{dataset_id}/tables/{table_id}

Property Value
Type Description
string

TableAsTableName

public TableName TableAsTableName { get; set; }

TableName-typed view over the Table resource name property.

Property Value
Type Description
TableName

TableModifiers

public ReadSession.Types.TableModifiers TableModifiers { get; set; }

Optional. Any modifiers which are applied when reading from the specified table.

Property Value
Type Description
ReadSessionTypesTableModifiers

TraceId

public string TraceId { get; set; }

Optional. ID set by client to annotate a session identity. This does not need to be strictly unique, but instead the same ID should be used to group logically connected sessions (e.g. All using the same ID for all sessions needed to complete a Spark SQL query is reasonable).

Maximum length is 256 bytes.

Property Value
Type Description
string