Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/20894
@gatorsmile For example, Spark is case sensitive for jsons:
```
cat ./case_sesitive.json
{"FIELD1": 1}
```
If schema is specified with field name "field1":
```
val schema=new StructType().add("field1", IntegerType)
spark.read.schema(schema).json("case_sesitive.json").show
```
it cannot match field:
```
+------+
|field1|
+------+
| null|
+------+
```
but if schema's field and actual json field in the same case:
```
val schema=new StructType().add("FIELD1", IntegerType)
spark.read.schema(schema).json("case_sesitive.json").show
```
```
+------+
|FIELD1|
+------+
| 1|
+------+
```
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