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