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Hive, mail # user - Any Scenarios in which Views impose performance penalties


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Re: Any Scenarios in which Views impose performance penalties
Ricky Saltzer 2013-08-21, 02:18
Since this bug was in Impala's query planner, I'm sure Hive is unaffected.
On Aug 20, 2013 10:15 PM, "Stephen Boesch" <[EMAIL PROTECTED]> wrote:

>
> Thanks v much Ricky.  Is this fixed in hive 0.11 - or going to be later
> i.e. 0.12?
>
>
> 2013/8/20 Ricky Saltzer <[EMAIL PROTECTED]>
>
>> Although this is already fixed in the next and upcoming impala release,
>> you might want to be aware of the following view limitation.
>>
>> https://issues.cloudera.org/browse/IMPALA-495
>> On Aug 20, 2013 7:16 PM, "Stephen Boesch" <[EMAIL PROTECTED]> wrote:
>>
>>> Views should theoretically not incur performance penalties: they simply
>>> represent queries. Are there situtions that things are "not that simple" -
>>> i.e. views may actually result in different exeucution plans than the
>>> underlying sql?
>>>
>>> Additionally, are there views-related bugs that we should be aware of
>>> that would limit the occasions that we could use them?
>>>
>>> Thanks for the pointers.
>>>
>>>
>>>
>