Postgres 11 comes with the new JIT compilation feature:

https://www.postgresql.org/about/news/1855/
https://www.postgresql.org/docs/devel/static/jit-reason.html

PostgreSQL 11 introduces support for Just-In-Time (JIT) compilation to optimize the execution of code and other operations at run time. Using components of the LLVM project, the introduction of JIT support in PostgreSQL accelerates queries that utilize expressions (e.g. WHERE clauses), target lists, aggregates, projections, as well as some internal operations.

The JIT framework in PostgreSQL is designed to allow future work for optimizations that can be added in the future. If you are building PostgreSQL 11 from source, you can enable JIT compilation using the --with-llvm flag.

Also from:

https://www.postgresql.org/docs/devel/static/install-procedure.html#CONFIGURE-WITH-LLVM

Build with support for LLVM based JIT compilation (see Chapter 32). This requires the LLVM library to be installed. The minimum required version of LLVM is currently 3.9.

LLVM support requires a compatible clang compiler (specified, if necessary, using the CLANG environment variable), and a working C++ compiler (specified, if necessary, using the CXX environment variable).

Would be great to have JIT in Postgres 11 Docker images.