I was wondering if it is possible to write a MySQL User Defined Function (UDF) in Go.   So I tried and I got a very basic UDF working. mysql> SELECT udf_fileexists_go("/etc/hosts"); +---------------------------------+ | udf_fileexists_go("/etc/hosts") | +---------------------------------+ | 1 | +---------------------------------+ 1 row in set (0.00 sec) mysql> SELECT udf_fileexists_go("/nonexistend"); +-----------------------------------+ | udf_fileexists_go("/nonexistend") | +-----------------------------------+ | 0 | +-----------------------------------+ 1 row in set (0.00 sec) This is nowhere near production quality, so be careful. The code is here: https://github.com/dveeden/udf_fileexists_go/blob/master/udf_fileexists_go.go .