fix(csharp): prevent percent-encoding of '?' in HTTP path query parameters

[eric-wang-1990]

Summary

• UriBuilder percent-encodes ? as %3F when a query string is embedded in the path argument (e.g. Databricks warehouse paths like /sql/1.0/warehouses/<id>?o=<orgId>)
• Fix by splitting the path on ? and assigning the query portion to UriBuilder.Query separately, using Substring for net472/netstandard2.0 compatibility
• Adds unit tests covering paths with query parameters, plain paths, and the full-URI passthrough case

Test plan

• GetBaseAddress_PathWithQueryParam_DoesNotPercentEncodeQuestionMark — verifies ? is not encoded as %3F and path/query are correctly separated
• GetBaseAddress_PathWithoutQueryParam_ReturnsExpectedUri — verifies plain paths are unaffected
• GetBaseAddress_FullUri_ReturnsUriDirectly — verifies full URI passthrough is unchanged

🤖 Generated with Claude Code

[eric-wang-1990]

Code review

Found 1 issue:

1. Reflection flags will cause all tests to throw at runtime — BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.FlattenHierarchy does not surface protected static members from base classes. FlattenHierarchy only works with BindingFlags.Public, not NonPublic. Since GetBaseAddress is protected static on HiveServer2Connection, the GetMethod call returns null and every test throws InvalidOperationException("GetBaseAddress method not found") instead of running. The fix is to use BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy (since protected is treated as public for FlattenHierarchy purposes).

hiveserver2/csharp/test/Hive2/HiveServer2ConnectionGetBaseAddressTest.cs

Lines 95 to 104 in 950c58e

	var connection = new SparkHttpConnection(new Dictionary<string, string>());
	MethodInfo? method = connection.GetType().GetMethod(
	"GetBaseAddress",
	BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.FlattenHierarchy,
	null,
	new[] { typeof(string), typeof(string), typeof(string), typeof(string), typeof(string), typeof(bool) },
	null);
	if (method == null)

🤖 Generated with Claude Code

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[birschick-bq]

There is an UriBuilder overload that takes the query.

[birschick-bq]

License text requirement for new test file ...

Apache RAT Check.........................................................Failed
- hook id: rat
- duration: 3.96s
- exit code: 1

Checking licenses for /home/runner/work/hiveserver2/hiveserver2
Using Apache RAT: /home/runner/.cache/adbc-drivers-dev/apache-rat-0.16.1.jar
Files that should not have 'This file has been modified' header:
- csharp/test/Hive2/HiveServer2ConnectionGetBaseAddressTest.cs

Error: Process completed with exit code 1.

[birschick-bq]

Looks good.