Julian Hyde (Apache Calcite author) has a side project called Morel
Morel is an ML dialect that can compile set-producing expressions into bytecode that Calcite can execute against databases
Sort of like "If you could query anything with SQL but it's ML instead"
I bring this up because the example query looks very similar to Morel queries
Neat xample of solving a combinatorial optimization problem with a single query that he posted recently to Twitter: