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The Instance.hidden\u003dFalse\nchange introduced in Train[1] used such a default on the new column, which caused\nat least one real-world deployment to time out rewriting the instances table\ndue to size. Apparently SQLAlchemy-migrate also does not consider such a timeout\nto be a failure and proceeds on. The end result is that some existing instances\nin the database have hidden\u003dNULL values, and the DB model layer does not convert\nthose to hidden\u003dFalse when we read/query them, causing those instances to be\nexcluded from the API list view.\n\nThis change alters the 399 schema migration to remove the default\u003dFalse\nspecification. This does not actually change the schema, but /will/ prevent\nusers who have not yet upgraded to Train from rewriting the table.\n\nThis change also makes the instance_get_all_by_filters() code handle hidden\nspecially, including false and NULL in a query for non-hidden instances.\n\nA future change should add a developer trap test to ensure that future migrations\ndo not add default\u003d values to new columns to avoid this situation in the future.\n\n[1] Iaffb27bd8c562ba120047c04bb62619c0864f594\n\nChange-Id: Iace3f653b42c20887b40ee0105c8e9a4edeff1f7\nCloses-Bug: #1862205\n(cherry picked from commit 001f3a7bfe6b2c8af135daff8e154a708792070e)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/8363905a6a6d5c8b2488619bdf807c5dc17b2842"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/8363905a6a6d5c8b2488619bdf807c5dc17b2842"}]},"branch":"refs/heads/stable/train"}},"requirements":[],"submit_records":[],"submit_requirements":[]}