Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12801#issuecomment-217070994
Regarding SPARK-15026, my major concern is we might get JIRAs if the
previous `Drop Partition` command only drops a subset of partitions. If users
issue the same command, they will get an error message:
```
org.apache.spark.sql.AnalysisException: partition to drop 'Map(ds ->
2008-04-08)' does not exist in table 'exttable_with_partitions' database
'default';
```
If you do not think this is a big deal, we need to issue a better error
message. Let users know which partitions have been dropped and which partitions
have not been dropped. This error message could be pretty long if one partial
partition spec corresponds a long list of partitions. I am not sure if there
exists any length limit of an exception message.
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