ueshin opened a new pull request #23534: [SPARK-26610 ][PYTHON] Fix inconsistency between toJSON Method in Python and Scala. URL: https://github.com/apache/spark/pull/23534 ## What changes were proposed in this pull request? `DataFrame.toJSON()` in PySpark should return `DataFrame` of JSON string instead of `RDD`. The method in Scala/Java was changed to return `DataFrame` before, but the one in PySpark was not changed at that time. Also introduced a config `spark.sql.legacy.pyspark.dataframe.toJsonShouldReturnDataFrame` to restore the previous behavior. ## How was this patch tested? Added a test and existing tests.
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