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0f6d9ffd22
Prepared LIST statements were not calculating metadata in PREPARE path, and sent empty string hash to client causing problematic behaviour where metadat_id was not recalculated correctly. This patch moves metadata construction into get_result_metadata() for the affected LIST statements and reuse that metadata when building the result set. This gives PREPARE a stable metadata id for LIST ROLES, LIST USERS, LIST PERMISSIONS and the service-level variants. This patch also adds a new boost test that verifies that when an EXECUTE request carries an empty result metadata id while the server has a real metadata id for the result set, the response is marked METADATA_CHANGED and includes the full result metadata plus the server metadata id. This covers the recovery path for clients that send an empty or otherwise unusable metadata id instead of a matching cached one.