Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/1351#issuecomment-48688064
For `csvFile` and `header=true`, if we are reading files in a directory, I
think we need to figure out if all files have the header or not.
Also, when we are reading multiple files, what will we do if those files
have different schemas (if `header=true`, some fields appear in some files but
not all and if `header=false`, two files have different number of fields)? I
think it makes sense to union those `StructType`s (generated based on those
files with different schemas). It will be also helpful if we can let the user
know that those files contain different schemas and we have generated the most
general schema.
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