SQL compatibility and DDL introspection polish for admin tools

[MPCoreDeveloper]

Summary

Improve SQL compatibility and DDL/introspection behavior required by admin tools.

Why

Many tools execute introspection SQL and DDL probes beyond regular CRUD workloads.

Scope

• Identify unsupported or partially supported SQL patterns from tool traces.
• Improve compatibility paths for common introspection statements.
• Normalize command tags and result metadata where needed.

Implementation Plan

1. Capture failing SQL traces from target tools.
2. Group failures by parser, execution, metadata, or result-shape category.
3. Implement incremental fixes with regression tests.
4. Re-run tool compatibility scripts.

Acceptance Criteria

• Reduced introspection/DDL failures in target tools.
• Regression test set for known query patterns.
• Release notes document improved compatibility.

Dependencies

• Depends on matrix data and protocol hardening.