Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12146#issuecomment-207709045
Actually, when we drop the external table, we do delete the data.
If we do not want to delete the data, we need to change the following value
from `true` to `false`, which is the @param `deleteData` (i.e., deletes the
underlying data along with metadata)
https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala#L345
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