You can write custom functions in C that you install and run on the cluster. SQL-MapReduce functions written in C are invoked using a SQL SELECT, just like SQL-MapReduce functions written in Java.
Aster Execution Engine provides a C SDK for developing and testing your C functions locally on your development workstation, before you install and run them on the cluster. To deploy an SQL-MapReduce function, you write the function, compile it into a shared library (.so file), test it, and use the ACT \install command to install it on the cluster. The function is usable by all Aster SQL users.
This section lists the resources provided in the SDK and explains how to write and test SQL-MapReduce functions in C.