Macro udf_log 

macro_rules! udf_log {
    (Critical: $($msg:tt)*) => { ... };
    (Error: $($msg:tt)*) => { ... };
    (Warning: $($msg:tt)*) => { ... };
    (Note: $($msg:tt)*) => { ... };
    (Debug: $($msg:tt)*) => { ... };
    ($msg:tt) => { ... };
}

Print a formatted log message to stderr to display in server logs

Performs formatting to match other common SQL error logs, roughly:

2022-10-15 13:12:54+00:00 [Warning] Udf: this is the message

use udf::udf_log;

// Prints "2022-10-08 05:27:30+00:00 [Error] UDF: this is an error"
// This matches the default entrypoint log format
udf_log!(Error: "this is an error");

udf_log!(Warning: "this is a warning");

udf_log!(Note: "this is info: value {}", 10 + 10);

udf_log!(Debug: "this is a debug message");

udf_log!("i print without the '[Level] UDF:' formatting");