PySpark: заменить строку числовыми значениями

У меня есть следующая таблица:

 +----------+----------+--------------------+--------------------+--------------------+--------------------+--------------------+
    |  _created|  _updated|                name|         description|          indication|                name|      patents_patent|
    +----------+----------+--------------------+--------------------+--------------------+--------------------+--------------------+
    |2005-06-13|2016-08-17|           Lepirudin|Lepirudin is iden...|For the treatment...|           Lepirudin|{"data" : [{"coun...|
    |2005-06-13|2017-04-27|           Cetuximab|Cetuximab is an e...|Cetuximab, used i...|           Cetuximab|{"data" : [{"coun...|
    |2005-06-13|2017-06-14|        Dornase alfa|Dornase alfa is a...|Used as adjunct t...|        Dornase alfa|{"data" : [{"coun...|
    |2005-06-13|2016-08-17| Denileukin diftitox|A recombinant DNA...|For treatment of ...| Denileukin diftitox|                NULL|
    |2005-06-13|2017-03-10|          Etanercept|Dimeric fusion pr...|Etanercept is ind...|          Etanercept|{"data" : [{"coun...|
    |2005-06-13|2017-07-06|         Bivalirudin|Bivalirudin is a ...|For treatment of ...|         Bivalirudin|{"data" : [{"coun...|
    |2005-06-13|2017-07-05|          Leuprolide|Leuprolide belong...|For treatment of ...|          Leuprolide|{"data" : [{"coun...|
    |2005-06-13|2017-06-16|Peginterferon alf...|Peginterferon alf...|Peginterferon alf...|Peginterferon alf...|{"data" : [{"coun...|
    |2005-06-13|2017-06-08|           Alteplase|Human tissue plas...|For management of...|           Alteplase|                NULL|
    |2005-06-13|2016-12-08|          Sermorelin|Sermorelin acetat...|For the treatment...|          Sermorelin|                NULL|
    |2005-06-13|2016-08-17|  Interferon alfa-n1|Purified, natural...|For treatment of ...|  Interferon alfa-n1|                NULL|

В идеале мне нужно будет вывести 2 таблицы:

table_one Я отфильтрую таблицу, в которой патент_патент не равен NULL, и заменю строки в патенте-патенте на 1:

+----------+----------+--------------------+--------------------+--------------------+--------------------+--------------------+
    |  _created|  _updated|                name|         description|          indication|                name|      patents_patent|
    +----------+----------+--------------------+--------------------+--------------------+--------------------+--------------------+
    |2005-06-13|2016-08-17|           Lepirudin|Lepirudin is iden...|For the treatment...|           Lepirudin|1|
    |2005-06-13|2017-04-27|           Cetuximab|Cetuximab is an e...|Cetuximab, used i...|           Cetuximab|1|
    |2005-06-13|2017-06-14|        Dornase alfa|Dornase alfa is a...|Used as adjunct t...|        Dornase alfa|1|
    |2005-06-13|2017-03-10|          Etanercept|Dimeric fusion pr...|Etanercept is ind...|          Etanercept|1|
    |2005-06-13|2017-07-06|         Bivalirudin|Bivalirudin is a ...|For treatment of ...|         Bivalirudin|1|
    |2005-06-13|2017-07-05|          Leuprolide|Leuprolide belong...|For treatment of ...|          Leuprolide|1|
    |2005-06-13|2017-06-16|Peginterferon alf...|Peginterferon alf...|Peginterferon alf...|Peginterferon alf...|1|
    |

table_two = отфильтровать таблицу, в которой патент_патента равен нулю, и заменить ноль на 0

    +----------+----------+--------------------+--------------------+--------------------+--------------------+--------------------+
   |  _created|  _updated|                name|         description|          indication|                name|      patents_patent|
    +----------+----------+--------------------+--------------------+--------------------+--------------------+------------------
   |2005-06-13|2016-08-17| Denileukin diftitox|A recombinant DNA...|For treatment of ...| Denileukin diftitox|                0|

    |2005-06-13|2017-06-08|           Alteplase|Human tissue plas...|For management of...|           Alteplase|                0|
    |2005-06-13|2016-12-08|          Sermorelin|Sermorelin acetat...|For the treatment...|          Sermorelin|                0|
    |2005-06-13|2016-08-17|  Interferon alfa-n1|Purified, natural...|For treatment of ...|  Interferon alfa-n1|                0|

Я пробовал это:

Я пробовал это:

from pyspark.sql.functions import col, expr, when

data = table.where(col("patents_patent").isNull())

data = table.filter("patents_patent is not NULL")

Результаты неправильные или пустые:!

root
 |-- _created: string (nullable = true)
 |-- _updated: string (nullable = true)
 |-- name: string (nullable = true)
 |-- description: string (nullable = true)
 |-- indication: string (nullable = true)
 |-- patents_patent: string (nullable = true)

Спасибо за помощь !