I've never understood why RDBMSes don't offer a low-level protocol where, rather than a SQL statement, you can just send over the exact query-plan AST you want the DB to prepare in some binary encoding. Then you could pre-compile your hot OLTP queries and heavy OLAP reports offline against your existing DB schema, using the same sort of techniques that got Lucene its optimized Levenstein-automata JVM bytecode. You could even tweak the resulting plan, op by op, before letting it go to the DB—as if you were doing final ASM tweaks on a game in the 90s.