Port functional test scenarios for sparse columns to JUnit

[Ananya Garg (Ananya2)]

Summary

Ports all functional test (FX) scenarios for sparse columns from the legacy test framework to JUnit 5 in SparseTest.java, organized as @Nested test classes.

Changes

Adds 45 JUnit 5 tests across 5 nested test classes covering all FX sparse column scenarios:

• SparseCreationFxTests (9 tests) — Table creation with/without column set, sparse-only, wide table, illegal type, and column limit errors
• SparseInsertionFxTests (12 tests) — Named column and column set XML insertions across all table configurations, >1024 column insert, and named+colset conflict error
• SparseSelectFxTests (11 tests) — SELECT after creation/insertion, SELECT * column set behavior, >4096 column error, isSparseColumnSet boundary validation, and selectMethod=cursor
• SparseMetaDataFxTests (3 tests) — ParameterMetaData nullability and type validation with/without column set and wide tables
• SparseUpdateFxTests (10 tests) — Named column and column set XML updates across all table configurations

Testing

All tests are tagged with @Tag(Constants.legacyFx) and @Tag(Constants.xAzureSQLDW).

[Copilot]

Pull request overview

Ports legacy FX functional scenarios for SQL Server sparse columns into the JUnit 5 suite (SparseTest.java), organizing coverage into @Nested classes.

Changes:

• Adds JUnit 5 nested test groups for sparse column creation, insertion, selection, metadata, and update scenarios.
• Covers wide-table scenarios (e.g., >1024 sparse columns), column set XML behavior, and cursor selectMethod behavior.
• Adds error-path validations for invalid sparse types and column-count limits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.56%. Comparing base (0bdf85b) to head (8608843).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2922      +/-   ##
============================================
- Coverage     60.71%   60.56%   -0.16%     
+ Complexity     4953     4910      -43     
============================================
  Files           151      151              
  Lines         35022    35022              
  Branches       5856     5856              
============================================
- Hits          21265    21212      -53     
- Misses        10953    10959       +6     
- Partials       2804     2851      +47     

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