Migrate to Private Docker Image & Add Federated Queries Test Suite

[mkottakota1]

Description

This PR adds comprehensive test coverage for the ODBCLoader's federated query capabilities while migrating the CI/CD pipeline from the public Vertica Docker image to a private image for enhanced security, control, and customization.

Changes

Test Suite

• New test file: tests/federated_queries.sql - Contains four test scenarios demonstrating federated query functionality:

  1. Predicate Pushdown - Validates that WHERE conditions are pushed down to the external database
  2. Column Pruning - Verifies that only required columns are fetched from the external source
  3. Federated Joins - Tests joining external tables with Vertica-managed tables
  4. Complex Predicates - Ensures multiple WHERE conditions are properly optimized

• Expected output file: tests/expected/federated_queries.out - Contains baseline expected results for test validation

• Updated Makefile:

  • Modified test target to run federated queries test suite
  • Added test_debug target for easier troubleshooting
  • Enhanced test output with dynamic progress indicators and validation status

Infrastructure

• Docker Image Migration:
  • Migrated from public vertica/vertica-ce image to private custom Docker image
  • Updated GitHub Actions workflow to use private image registry
  • Added Docker authentication for private image access
  • Improved build consistency and security posture

Testing

• All tests pass successfully with live output display
• Test validation compares actual results against expected output
• ODBC driver compatibility ensured across different MySQL ODBC versions
• Tests run against private Vertica image with enhanced configuration

Motivation

1. Federated Queries: Essential feature for joining Vertica tables with external databases while optimizing data movement through predicate pushdown and column pruning
2. Private Image: Provides better control over dependencies, security patches, and custom configurations for CI/CD pipeline stability

Related Issues

Closes #[issue-number]

Checklist

• Federated queries tests added/updated
• Expected output files created
• Makefile updated with new test targets
• All tests passing with private image
• GitHub Actions workflow updated for private image registry
• Docker authentication configured
• CI/CD pipeline validated