Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/9223#issuecomment-151400091
Probably we also need to add the assertion at:
```scala
class HadoopFsRelation {
...
final private[sql] def buildScan(
requiredColumns: Array[String],
filters: Array[Filter],
inputPaths: Array[String],
broadcastedConf: Broadcast[SerializableConfiguration])
...
}
```
I'll agree the JsonRelation is not exactly the same case, as we will try to
infer the schema in another code path.
So will that be OK if we add assertion at the `buildScan` in the parent
class(as above), and also add the assertion at the `override lazy val
dataSchema = ...` in `JsonRelation`(not the `createBaseRdd`)?
/cc @liancheng
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