The document discusses new optimizer features in recent and upcoming MariaDB releases. MariaDB 10.8 introduced JSON histograms and support for reverse-ordered indexes. JSON produced by the optimizer is now valid and processible. MariaDB 10.9 added SHOW EXPLAIN FORMAT=JSON and SHOW ANALYZE can return partial results. MariaDB 10.10 enabled table elimination for derived tables and improved optimization of many-table joins. Future releases will optimize queries on stored procedures and show optimizer timing in EXPLAIN FORMAT=JSON.