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From Navis류승우 <navis....@nexr.com>
Subject Re: Hive can I contribute to Hive confluence wiki documents?
Date Sun, 13 Jul 2014 07:57:48 GMT
For "cache.expr.evaluation" problem, it's fixed in
https://issues.apache.org/jira/browse/HIVE-7314 (will be included in next
release)

But I agree that it can be a critical problem for users of 0.12.0 and
0.13.x version and need proper warning on that.

Thanks,
Navis


2014-07-13 16:48 GMT+09:00 郭士伟 <guoshiwei@gmail.com>:

> And I haven't add other information in the wikidoc yet.
>
>
> 2014-07-04 14:37 GMT+08:00 Lefty Leverenz <leftyleverenz@gmail.com>:
>
>> The 'hive.cache.expr.evaluation' parameter is documented in the wikidoc Configuration
>> Properties
>> <https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cache.expr.evaluation>.
>>  Have you added other information in a different wikidoc?  If so, I'll link
>> the docs to each other.
>>
>> -- Lefty
>>
>>
>> On Thu, May 29, 2014 at 5:31 AM, Lefty Leverenz <leftyleverenz@gmail.com>
>> wrote:
>>
>>> Thank you for pointing this out.  The 'hive.cache.expr.evaluation'
>>> parameter was added by HIVE-4209
>>> <https://issues.apache.org/jira/browse/HIVE-4209> and it needs to be
>>> included in the wiki.  Its description is in hive-default.xml.template:
>>>
>>> If true, evaluation result of deterministic expression referenced twice
>>>> or more will be cached. For example, in filter condition like ".. where key
>>>> + 10 > 10 or key + 10 = 0" "key + 10" will be evaluated/cached once and
>>>> reused for following expression ("key + 10 = 0"). Currently, this is
>>>> applied only to expressions in select or filter operator.
>>>
>>>
>>> Do you want to provide more information than that?  To contribute to the
>>> wiki, create a Confluence account
>>> <https://cwiki.apache.org/confluence/signup.action> and send a message
>>> to this list asking for wiki editing privilege and giving your account
>>> name.  But if you just want the description to be added to the wiki, I can
>>> take care of that.
>>>
>>> If you have additional information, it might not belong in Configuration
>>> Properties
>>> <https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties>
(although
>>> once the parameter is there it can link to another page for details).  The
>>> Select
>>> <https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select>
>>> page is one possibility, or maybe you'll find a better place for it.
>>>
>>> If you want to revise the description in hive-default.xml.template, you
>>> need to open a JIRA and patch the file.
>>>
>>>
>>> -- Lefty
>>>
>>>
>>> On Sat, May 24, 2014 at 1:01 AM, 郭士伟 <guoshiwei@gmail.com> wrote:
>>>
>>>> I have used a configuration property 'hive.cache.expr.evaluation' in
>>>> hive 0.12 recently and found it useful. But I cannot find any documents
>>>> about it on the wiki page:
>>>> https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties.
>>>> Indeed, I pick it up from the source code.
>>>>
>>>> I think it maybe useful for other hive users if I can write some
>>>> documents about the property.
>>>>
>>>> So, can anyone give me some pointers that how can I make the change
>>>> happen ?
>>>>
>>>> Thanks, anyway.
>>>>
>>>
>>>
>>
>

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