presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/ColumnMapping.java/ColumnMapping/sliceMapping
class ColumnMapping:    public static ColumnMapping sliceMapping(Type prestoType, SliceReadFunction readFunction, SliceWriteFunction writeFunction)
    {
        return sliceMapping(prestoType, readFunction, writeFunction, UnaryOperator.identity());
    }