Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17956
This PR also introduces the following behavior changes.
```Scala
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)
```
Before this PR, the output is like
```
+----+
| f|
+----+
|null|
|null|
|null|
+----+
```
After this PR, the output is like
```
+----+
| f|
+----+
|18.00|
|18.30|
|20.00|
+----+
```
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