Fix DatabaseMetaData.getIndexInfo() fallback for Synapse server

[Ananya2]

Problem

DatabaseMetaData.getIndexInfo() fails on Azure Synapse serverless SQL pool with error:
PROCEDURE 'sp_statistics' is not supported in the current database

This occurs because Synapse serverless SQL pool does not support the sp_statistics stored procedure that the JDBC driver relies on for index metadata retrieval.

Solution

Implemented a robust try-catch fallback mechanism in getIndexInfoAzureDW() method:

Changes Made:

1. Added try-catch wrapper around sp_statistics execution in Azure DW path
2. Fallback to sys.indexes query when sp_statistics fails using existing INDEX_INFO_QUERY_DW constant
3. Removed unique filtering to ensure consistent behavior across all execution paths
4. Proper error logging for debugging sp_statistics failures

Technical Details:

• Fallback Query: Uses sys.indexes, sys.index_columns, sys.columns, and sys.tables system views
• NON_UNIQUE Mapping: Correctly maps i.is_unique = 1 to NON_UNIQUE = 0 (JDBC standard)
• Error Handling: Graceful fallback with appropriate logging for troubleshooting
• Consistency: Both main execution path and fallback path return all indexes without unique filtering

Testing:

• Works on regular Azure SQL Database (sp_statistics available)
• Works on Azure Synapse serverless SQL pool (fallback to sys.indexes)
• Maintains backward compatibility with existing applications
• Returns consistent index metadata format across all platforms

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.31%. Comparing base (f58f35a) to head (5b65603).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...soft/sqlserver/jdbc/SQLServerDatabaseMetaData.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2839      +/-   ##
============================================
- Coverage     56.35%   56.31%   -0.04%     
  Complexity     4519     4519              
============================================
  Files           151      151              
  Lines         34435    34442       +7     
  Branches       5736     5738       +2     
============================================
- Hits          19405    19396       -9     
- Misses        12404    12417      +13     
- Partials       2626     2629       +3     

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