Macro ballista_core::declare_udf_plugin

macro_rules! declare_udf_plugin {
    ($curr_plugin_type:ty, $constructor:path) => { ... };
}

Declare a udf plugin registrar callback

Notes

This works by automatically generating an extern "C" function named registrar_udf_plugin with a pre-defined signature and symbol name. Therefore you will only be able to declare one plugin per library.