# Google BigQuery Storage v1 API - Class BigQueryReadClientImpl (3.19.0)

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    public sealed class BigQueryReadClientImpl : BigQueryReadClient

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

BigQueryRead client wrapper implementation, for convenient use.

## Inheritance

[object](https://learn.microsoft.com/dotnet/api/system.object) \> [BigQueryReadClient](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient) \> BigQueryReadClientImpl

## Inherited Members

[BigQueryReadClient.DefaultEndpoint](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_DefaultEndpoint) [BigQueryReadClient.DefaultScopes](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_DefaultScopes) [BigQueryReadClient.ServiceMetadata](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_ServiceMetadata) [BigQueryReadClient.CreateAsync(CancellationToken)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateAsync_System_Threading_CancellationToken_) [BigQueryReadClient.Create()](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_Create) [BigQueryReadClient.ShutdownDefaultChannelsAsync()](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_ShutdownDefaultChannelsAsync) [BigQueryReadClient.CreateReadSessionAsync(CreateReadSessionRequest, CancellationToken)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_Google_Cloud_BigQuery_Storage_V1_CreateReadSessionRequest_System_Threading_CancellationToken_) [BigQueryReadClient.CreateReadSession(string, ReadSession, int, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSession_System_String_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.CreateReadSessionAsync(string, ReadSession, int, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_System_String_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.CreateReadSessionAsync(string, ReadSession, int, CancellationToken)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_System_String_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_System_Threading_CancellationToken_) [BigQueryReadClient.CreateReadSession(ProjectName, ReadSession, int, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSession_Google_Api_Gax_ResourceNames_ProjectName_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.CreateReadSessionAsync(ProjectName, ReadSession, int, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_Google_Api_Gax_ResourceNames_ProjectName_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.CreateReadSessionAsync(ProjectName, ReadSession, int, CancellationToken)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_Google_Api_Gax_ResourceNames_ProjectName_Google_Cloud_BigQuery_Storage_V1_ReadSession_System_Int32_System_Threading_CancellationToken_) [BigQueryReadClient.ReadRows(string, long, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_ReadRows_System_String_System_Int64_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.ReadRows(ReadStreamName, long, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_ReadRows_Google_Cloud_BigQuery_Storage_V1_ReadStreamName_System_Int64_Google_Api_Gax_Grpc_CallSettings_) [BigQueryReadClient.SplitReadStreamAsync(SplitReadStreamRequest, CancellationToken)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_SplitReadStreamAsync_Google_Cloud_BigQuery_Storage_V1_SplitReadStreamRequest_System_Threading_CancellationToken_) [object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode) [object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) [object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)

## Namespace

[Google.Cloud.BigQuery.Storage.V1](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1)

## Assembly

Google.Cloud.BigQuery.Storage.V1.dll

## Remarks

BigQuery Read API.

The Read API can be used to read data from BigQuery.

## Constructors

### BigQueryReadClientImpl(BigQueryReadClient, BigQueryReadSettings, ILogger)

    public BigQueryReadClientImpl(BigQueryRead.BigQueryReadClient grpcClient, BigQueryReadSettings settings, ILogger logger)

Constructs a client wrapper for the BigQueryRead service, with the specified gRPC client and settings.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `grpcClient` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadhttps://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryRead.BigQueryReadClient` The underlying gRPC client. |
| `settings` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadSettings` The base [BigQueryReadSettings](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadSettings) used within this client. |
| `logger` | `https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger` Optional [ILogger](https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger) to use within this client. |

## Properties

### GrpcClient

    public override BigQueryRead.BigQueryReadClient GrpcClient { get; }

The underlying gRPC BigQueryRead client

| **Property Value** ||
|---|---|
| **Type** | **Description** |
| `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadhttps://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryRead.BigQueryReadClient` |   |

**Overrides** [BigQueryReadClient.GrpcClient](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_GrpcClient)

## Methods

### CreateReadSession(CreateReadSessionRequest, CallSettings)

    public override ReadSession CreateReadSession(CreateReadSessionRequest request, CallSettings callSettings = null)

Creates a new read session. A read session divides the contents of a
BigQuery table into one or more streams, which can then be used to read
data from the table. The read session also specifies properties of the
data to be read, such as a list of columns or a push-down filter describing
the rows to be returned.

A particular row can be read by at most one stream. When the caller has
reached the end of each stream in the session, then all the data in the
table has been read.

Data is assigned to each stream such that roughly the same number of
rows can be read from each stream. Because the server-side unit for
assigning data is collections of rows, the API does not guarantee that
each stream will return the same number or rows. Additionally, the
limits are enforced based on the number of pre-filtered rows, so some
filters can lead to lopsided assignments.

Read sessions automatically expire 6 hours after they are created and do
not require manual clean-up by the caller.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `request` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.CreateReadSessionRequest` The request object containing all of the parameters for the API call. |
| `callSettings` | `https://cloud.google.com/dotnet/docs/reference/Google.Api.Gax/latest/Google.Api.Gax.Grpc.CallSettings.html` If not null, applies overrides to this RPC call. |

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.ReadSession` | The RPC response. |

**Overrides** [BigQueryReadClient.CreateReadSession(CreateReadSessionRequest, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSession_Google_Cloud_BigQuery_Storage_V1_CreateReadSessionRequest_Google_Api_Gax_Grpc_CallSettings_)

### CreateReadSessionAsync(CreateReadSessionRequest, CallSettings)

    public override Task<ReadSession> CreateReadSessionAsync(CreateReadSessionRequest request, CallSettings callSettings = null)

Creates a new read session. A read session divides the contents of a
BigQuery table into one or more streams, which can then be used to read
data from the table. The read session also specifies properties of the
data to be read, such as a list of columns or a push-down filter describing
the rows to be returned.

A particular row can be read by at most one stream. When the caller has
reached the end of each stream in the session, then all the data in the
table has been read.

Data is assigned to each stream such that roughly the same number of
rows can be read from each stream. Because the server-side unit for
assigning data is collections of rows, the API does not guarantee that
each stream will return the same number or rows. Additionally, the
limits are enforced based on the number of pre-filtered rows, so some
filters can lead to lopsided assignments.

Read sessions automatically expire 6 hours after they are created and do
not require manual clean-up by the caller.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `request` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.CreateReadSessionRequest` The request object containing all of the parameters for the API call. |
| `callSettings` | `https://cloud.google.com/dotnet/docs/reference/Google.Api.Gax/latest/Google.Api.Gax.Grpc.CallSettings.html` If not null, applies overrides to this RPC call. |

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `https://learn.microsoft.com/dotnet/api/system.threading.tasks.task-1https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.ReadSession` | A Task containing the RPC response. |

**Overrides** [BigQueryReadClient.CreateReadSessionAsync(CreateReadSessionRequest, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_CreateReadSessionAsync_Google_Cloud_BigQuery_Storage_V1_CreateReadSessionRequest_Google_Api_Gax_Grpc_CallSettings_)

### ReadRows(ReadRowsRequest, CallSettings)

    public override BigQueryReadClient.ReadRowsStream ReadRows(ReadRowsRequest request, CallSettings callSettings = null)

Reads rows from the stream in the format prescribed by the ReadSession.
Each response contains one or more table rows, up to a maximum of 128 MB
per response; read requests which attempt to read individual rows larger
than 128 MB will fail.

Each request also returns a set of stream statistics reflecting the current
state of the stream.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `request` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.ReadRowsRequest` The request object containing all of the parameters for the API call. |
| `callSettings` | `https://cloud.google.com/dotnet/docs/reference/Google.Api.Gax/latest/Google.Api.Gax.Grpc.CallSettings.html` If not null, applies overrides to this RPC call. |

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClienthttps://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient.ReadRowsStream` | The server stream. |

**Overrides** [BigQueryReadClient.ReadRows(ReadRowsRequest, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_ReadRows_Google_Cloud_BigQuery_Storage_V1_ReadRowsRequest_Google_Api_Gax_Grpc_CallSettings_)

### SplitReadStream(SplitReadStreamRequest, CallSettings)

    public override SplitReadStreamResponse SplitReadStream(SplitReadStreamRequest request, CallSettings callSettings = null)

Splits a given `ReadStream` into two `ReadStream` objects. These
`ReadStream` objects are referred to as the primary and the residual
streams of the split. The original `ReadStream` can still be read from in
the same manner as before. Both of the returned `ReadStream` objects can
also be read from, and the rows returned by both child streams will be
the same as the rows read from the original stream.

Moreover, the two child streams will be allocated back-to-back in the
original `ReadStream`. Concretely, it is guaranteed that for streams
original, primary, and residual, that original\[0-j\] = primary\[0-j\] and
original\[j-n\] = residual\[0-m\] once the streams have been read to
completion.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `request` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.SplitReadStreamRequest` The request object containing all of the parameters for the API call. |
| `callSettings` | `https://cloud.google.com/dotnet/docs/reference/Google.Api.Gax/latest/Google.Api.Gax.Grpc.CallSettings.html` If not null, applies overrides to this RPC call. |

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.SplitReadStreamResponse` | The RPC response. |

**Overrides** [BigQueryReadClient.SplitReadStream(SplitReadStreamRequest, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_SplitReadStream_Google_Cloud_BigQuery_Storage_V1_SplitReadStreamRequest_Google_Api_Gax_Grpc_CallSettings_)

### SplitReadStreamAsync(SplitReadStreamRequest, CallSettings)

    public override Task<SplitReadStreamResponse> SplitReadStreamAsync(SplitReadStreamRequest request, CallSettings callSettings = null)

Splits a given `ReadStream` into two `ReadStream` objects. These
`ReadStream` objects are referred to as the primary and the residual
streams of the split. The original `ReadStream` can still be read from in
the same manner as before. Both of the returned `ReadStream` objects can
also be read from, and the rows returned by both child streams will be
the same as the rows read from the original stream.

Moreover, the two child streams will be allocated back-to-back in the
original `ReadStream`. Concretely, it is guaranteed that for streams
original, primary, and residual, that original\[0-j\] = primary\[0-j\] and
original\[j-n\] = residual\[0-m\] once the streams have been read to
completion.

| **Parameters** ||
|---|---|
| **Name** | **Description** |
| `request` | `https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.SplitReadStreamRequest` The request object containing all of the parameters for the API call. |
| `callSettings` | `https://cloud.google.com/dotnet/docs/reference/Google.Api.Gax/latest/Google.Api.Gax.Grpc.CallSettings.html` If not null, applies overrides to this RPC call. |

| **Returns** ||
|---|---|
| **Type** | **Description** |
| `https://learn.microsoft.com/dotnet/api/system.threading.tasks.task-1https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.SplitReadStreamResponse` | A Task containing the RPC response. |

**Overrides** [BigQueryReadClient.SplitReadStreamAsync(SplitReadStreamRequest, CallSettings)](https://docs.cloud.google.com/dotnet/docs/reference/Google.Cloud.BigQuery.Storage.V1/latest/Google.Cloud.BigQuery.Storage.V1.BigQueryReadClient#Google_Cloud_BigQuery_Storage_V1_BigQueryReadClient_SplitReadStreamAsync_Google_Cloud_BigQuery_Storage_V1_SplitReadStreamRequest_Google_Api_Gax_Grpc_CallSettings_)