Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12801#issuecomment-217070045
@andrewor14 For the defect mentioned in SPARK-14684, you can reproduce it
by using the following statement:
```
sql(s"ALTER TABLE $externalTab DROP PARTITION (ds='2008-04-09',
unknownCol='12')")
```
Above example uses an invalid partition spec. Without this PR, we will drop
all the partitions. The reason is Hive megastores `getPartitions` API returns
all the partitions if we provide an invalid spec.
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