C# Client support V2 read interface

[lausannel]

Introduced a V2 data reading interface based on TSBlock, aligned with the design of the Go client

[CritasWang]

Let's keep the user's performance unchanged
HasNext
Next
This can be used as a new method, but the semantics of the old method should not be changed
public RowRecord GetRow() => _rpcDataSet.GetRow();

[Copilot]

Pull Request Overview

This PR introduces a V2 data reading interface based on TSBlock and aligns the C# client design with the Go client. Key changes include:

• Changing default timezone identifiers from "UTC+08:00" to "Asia/Shanghai".
• Updating SessionPool calls to new RPC methods (dropping Async suffix) and wiring up TSBlock-based streaming.
• Adding core data‐structure support: TsBlock, RpcDataSet, ColumnDecoder, Column, and extending ByteBuffer.

Reviewed Changes

Copilot reviewed 22 out of 125 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
TableSessionPool.Builder.cs, SessionPool.Builder.cs	Updated default _zoneId initialization to "Asia/Shanghai".
SessionPool.cs	Swapped deprecated async calls for new V2 methods; updated timezone.
DataStructure/TsBlock.cs	Added TsBlock deserialization and validation logic.
DataStructure/RpcDataSet.cs	New streaming class to iterate through TSBlocks over RPC V2.
DataStructure/ColumnDecoder.cs, Column.cs	Core interfaces and implementations for decoding column data.
DataStructure/ByteBuffer.cs	Added GetBytesbyLength helper for length‐based reads.
DataStructure/SessionDataSet.cs	Refactored to delegate to RpcDataSet with new constructor.
Client.cs	Added GetDataTypeByStr helper for mapping string types to enum.
IoTDBDataReader.cs	Updated to use Next()/GetRow() instead of HasNext()/Next().
IoTDBConnectionStringBuilder.cs	Updated default _zoneId to "Asia/Shanghai".
samples/…	Refactored sample tests to use PrintDataSetByString and Next().
.github/workflows/pre-commit-format.yml	Upgraded runner from Ubuntu 20.04 to Ubuntu 22.04.

Comments suppressed due to low confidence (4)

src/Apache.IoTDB/DataStructure/ByteBuffer.cs:149

• Method name 'GetBytesbyLength' uses inconsistent casing; consider renaming to 'GetBytesByLength' to match .NET naming conventions.

        public byte[] GetBytesbyLength(int length)

src/Apache.IoTDB/DataStructure/SessionDataSet.cs:52

• [nitpick] Parameter '_clientQueueS' begins with an underscore and uppercase letter, which conflicts with C# parameter naming conventions. Consider renaming to 'clientQueue'.

        public SessionDataSet(

src/Apache.IoTDB/DataStructure/TsBlock.cs:80

• [nitpick] Variable 'valuecolumnEncodings' should be renamed to 'valueColumnEncodings' to follow camelCase convention and improve readability.

            var valuecolumnEncodings = new ColumnEncoding[valueColumnCount];

src/Apache.IoTDB/DataStructure/RpcDataSet.cs:29

• Public types and methods lack XML documentation comments. Consider adding summaries to explain usage for key public APIs like RpcDataSet.

    public class RpcDataSet : System.IDisposable

[Copilot]

Constructors ignore the passed 'valueIsNull' array by hardcoding it to null; this discards null-indicator information. Pass the actual 'valueIsNull' parameter to the base class.

[CritasWang]

At present, iotdb itself will build csharp's RPC interface during the build process. Is it necessary to update Thrift to 0.15.0. Perhaps it would be better to maintain unity with IoTDB?