Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9060#issuecomment-155718158
@HyukjinKwon Oh yeah, sorry. Finally got sometime to clean my review queue
:)
I wonder is there an easy way to add a test case for this? At first I
thought `WriterVersion` corresponds to the the `version` field of the Thrift
struct `FileMetaData` described in [parquet-format] [1], but it's not. I only
found that when `WriterVersion` is set to v2, the Thrift field
`PageHeader.type` is set to `DATA_PAGE_V2`.
[1]: https://github.com/apache/parquet-format#metadata
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