Improve DDL plan cache invalidation and test infra#81
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Adds explicit plan cache invalidation after DDL operations (CREATE, ALTER, DROP TABLE) to ensure schema changes are immediately visible, especially on cluster followers. Refactors DataFusion provider registration to always deregister before re-registering on ALTER TABLE. Enhances logging for schema and provider changes. Adds plan cache diagnostics and a comprehensive test to verify plan cache clearing after DDL. Updates CLI test infrastructure with helper scripts, environment variable documentation, and new smoke tests for ALTER TABLE with data. Improves cluster test reliability with polling for schema/data propagation.
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Adds explicit plan cache invalidation after DDL operations (CREATE, ALTER, DROP TABLE) to ensure schema changes are immediately visible, especially on cluster followers. Refactors DataFusion provider registration to always deregister before re-registering on ALTER TABLE. Enhances logging for schema and provider changes. Adds plan cache diagnostics and a comprehensive test to verify plan cache clearing after DDL. Updates CLI test infrastructure with helper scripts, environment variable documentation, and new smoke tests for ALTER TABLE with data. Improves cluster test reliability with polling for schema/data propagation.