Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/999#issuecomment-45640690
My thought on `SchemaResolutionMode` is that we may be able to hide
implementation details on how we infer the schema by using
`SchemaResolutionMode` in `jsonFile` and `jsonRDD`. If we expose
`samplingRatio` in `jsonFile` and `jsonRDD`, when we have other methods to
infer the schema (lazy resolution), we need to change existing interfaces or
add new interfaces.
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