HyukjinKwon commented on pull request #30984:
URL: https://github.com/apache/spark/pull/30984#issuecomment-757409794
@tedyu, the special characters are not allowed in some sources such as Hive
as you tested. However, they are allowed in some other sources when you use
DSLs:
```scala
scala>
spark.range(1).toDF("GetJsonObject(phone#37,$.phone)").write.option("header",
true).mode("overwrite").csv("/tmp/foo")
scala> spark.read.option("header", true).csv("/tmp/foo").show()
+-------------------------------+
|GetJsonObject(phone#37,$.phone)|
+-------------------------------+
| 0|
+-------------------------------+
```
In this case, the filters will still be pushed down to the datasource
implementation site. We should have a way to identify if the pushed
`GetJsonObject(phone#37,$.phone)` is a field or expression pushed down.
This makes me believe the current implementation based on strings are flaky,
and incomplete.
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