Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3780#issuecomment-70765307
For my understanding, `insertInto` works in the ways of `create new`,
`append` or `overwrite` already, but it doesn't give user an option, which
allow throwing exception when the file already existed. Probably that's why we
need the `saveAsParquetFile`, which in the semantic of `create new` if the file
doesn't exist, or `overwrite` provided by this PR.
I can close this PR if you feel this change is worthless.
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