presto-main/src/main/java/io/prestosql/operator/scalar/VarbinaryFunctions.java/VarbinaryFunctions/fromHexVarbinary
class VarbinaryFunctions:    @Description("decode hex encoded binary data")
    @ScalarFunction("from_hex")
    @SqlType(StandardTypes.VARBINARY)
    public static Slice fromHexVarbinary(@SqlType(StandardTypes.VARBINARY) Slice slice)
    {
        return fromHexVarchar(slice);
    }