HIVE-7314 is documented in the Configuration Properties wiki ( hive.cache.expr.evaluation <https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cache.expr.evaluation>) and at the beginning of the Operators and UDFs <https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF> wiki. The latter includes a link to this email thread.
Does that take care of it? -- Lefty On Sun, Jul 13, 2014 at 3:57 AM, Navis류승우 <navis....@nexr.com> wrote: > 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 <guoshi...@gmail.com>: > > And I haven't add other information in the wikidoc yet. >> >> >> 2014-07-04 14:37 GMT+08:00 Lefty Leverenz <leftylever...@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 <leftylever...@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 <guoshi...@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. >>>>> >>>> >>>> >>> >> >
