scala - Creating Encoder for case class containing custom object -

i have case class like:

case class dlt (date: java.time.localdate, loc: location, temp: double) 

where location case class like:

case class location (lat : double, lon : double) 

how can create custom encoder case class dlt? when have directly tried encoders.kryo[ldt] output coming single column unrelated values rather in separate columns. map function convert dataframe dataset follows:

ldt.map(ldtrow => ldt(localdate.of(ldtrow.getas[int]("year"),                                                      ldtrow.getas[int]("month"),                                                      ldtrow.getas[int]("day")                                                      ),                                         location(ldtrow.getas[double]("lat"),                                                  ldtrow.getas[double]("lon")                                                 ),                                         ldtrow.getas[double]("temp")))(ldtencoder) 

this printed on show() on dataframe:

|year|month|day|   lat|   lon|temp| +----+-----+---+------+------+----+ |1960|    1|  1|70.933|-8.667|23.2| |1960|    1|  2|70.933|-8.667|18.7| 

and, printed on show() on dataset:

|               value| +--------------------+ |[01 00 6f 62 73 6...| |[01 00 6f 62 73 6...| |[01 00 6f 62 73 6...| |[01 00 6f 62 73 6...| |[01 00 6f 62 73 6...|