Have you applied optimization using a request scheduler?

Query planner optimization is usually applied in the context of working with databases or systems where queries can be complex and resource-intensive.

The query planner analyzes an SQL query or similar, selecting the optimal order of operations (such as table joins, filters) to minimize execution time and system load.

In Java applications, if an ORM (like Hibernate) or JDBC is used, it is possible to indirectly influence the execution plan by optimizing the queries themselves, adding indexes, and using profiling and execution plan analysis through the DBMS.

Example: when working with Hibernate, you can enable SQL and execution plan logging to understand how the DBMS processes queries, and then rewrite queries or add indexes to improve performance.

Thus, although Java does not directly write a query planner, experience in query optimization considering the DBMS's planner is an important practice.