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Statistics PV Data error when set Hive.map.aggr=true

Source: Internet
Author: User
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Calculates the accumulated value, the de-value, from a table group by:

Set parallelism for efficiency: set Hive.exec.parallel=true (optional: Set hive.exec.parallel.thread.number=16), set hive.groupby.skewindata=true , set Hive.map.aggr=true

SelectPlat, PageType,Count (*)PvCount(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPlat, PageTypeUnion  AllSelectPlat' All'PageTypeCount (*)PvCount(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPlatUnion  AllSelect ' All'Plat, PageType,Count (*)PvCount(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPageTypeUnion  AllSelect ' All'Plat' All'PageTypeCount (*)PvCount(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19'

Bad is bad in: Set Hive.map.aggr=true,map end aggregation settings;

The PV number out is not the same as the true value;

Change the code below to run correctly;

SelectPlat, PageType,sum(1) PV,Count(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPlat, PageTypeUnion  AllSelectPlat' All'PageTypesum(1) PV,Count(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPlatUnion  AllSelect ' All'Plat, PageType,sum(1) PV,Count(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19' Group  byPageTypeUnion  AllSelect ' All'Plat' All'PageTypesum(1) PV,Count(distinctUserKey) UV fromClient_pv_formwhereDt= '2015-08-19'

Statistics PV Data error when set Hive.map.aggr=true

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