C# Client support V2 read interface

[lausannel]

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

[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?

[lausannel]

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?

The Thrift version has been reverted to 0.14.1