stczwd commented on a change in pull request #26098: [SPARK-29444] Add 
configuration to support JacksonGenrator to keep fields with null values
URL: https://github.com/apache/spark/pull/26098#discussion_r335817336
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -1153,6 +1153,12 @@ object SQLConf {
     .booleanConf
     .createWithDefault(true)
 
+  val JSON_GENERATOR_IGNORE_NULL_FIELDS =
+    buildConf("spark.sql.jsonGenerator.nullFields.ignore")
 
 Review comment:
   okey, I will change it.

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