stczwd commented on issue #26098: [SPARK-29444] Add configuration to support 
JacksonGenrator to keep fields with null values
URL: https://github.com/apache/spark/pull/26098#issuecomment-542996956
 
 
   @dilipbiswal Yes, but case is not right. If you want to preserve null 
values, you must write like this to disable ignoreNullFields.
   ```
   spark.sql("select null as a, 1 as 
b").write.format("json").option("ignoreNullFields", 
"false").save("/tmp/jsonfile")
   ```

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