Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/7342#issuecomment-120480480
You can put it in `org.apache.spark.sql.sources.PreWriteCheck` (it is a
`extendedCheckRules` configured in SQLContext and HiveContext), which is
located in sql/core. Eventually, we will move it out from the package of
`sources` since this is another round of write related checks.
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