Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/17956 Note, we do not support the following cases ``` def floatRecords: Dataset[String] = spark.createDataset(spark.sparkContext.parallelize( """{"f": "18.00"}""" :: """{"f": "18.30"}""" :: """{"f": "20.00"}""" :: Nil))(Encoders.STRING) val jsonDF = spark.read.schema("f float").json(floatRecords) ``` Basically, we do not assume users are use string in double columns for JSON data sources.
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