Github user yaooqinn commented on the issue:
https://github.com/apache/spark/pull/17335
The dbs and tbls may be created on hdfs via the real userï¼so that the
proxy user may have no rights to things such as:
```
Error: java.lang.RuntimeException: Cannot create staging directory
'hdfs://hz-test01/user/hive/warehouse/hzyaoqin.db/src2/.hive-staging_hive_2017-03-20_22-43-44_189_8479160175818973314-1':
Permission denied: user=hzyaoqin, access=WRITE,
inode="/user/hive/warehouse/hzyaoqin.db/src2/.hive-staging_hive_2017-03-20_22-43-44_189_8479160175818973314-1":hive:hdfs:drwxr-xr-x
```
Which means each `w` required hdfs operation has to be doAsRealUser. In
that case, proxy-users may could visit other proxy ones data. Do you meet that
error while using intert/ctas?
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