Ordinary Database Engine and Old Storage Syntax Deprecated for MergeTree Tables

Ordinary database engine and old storage definition syntax for *MergeTree tables are deprecated. By default it's not possible to create new databases with Ordinary engine. If system database has Ordinary engine it will be automatically converted to Atomic on server startup. There are settings to keep old behavior (allow_deprecated_database_ordinary and allow_deprecated_syntax_for_merge_tree), but these settings may be removed in future releases. #38335 (Alexander Tokmakov).