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. >>>> >>> >>> >> >
