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https://issues.apache.org/jira/browse/HIVE-219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joydeep Sen Sarma updated HIVE-219:
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Priority: Blocker (was: Critical)
this is absolutely broken.
i am trying count(1) with hive.map.aggr = true - and there is no map side
aggregation happening (even though the explain has a map-side group by
operator):
Alias -> Map Operator Tree:
mm_users_goodip_count
Select Operator
Group By Operator
aggregations:
expr: count(1)
mode: hash
Reduce Output Operator
sort order:
Map-reduce partition columns:
expr: rand()
type: double
tag: -1
value expressions:
expr: 0
type: bigint
it seems that the groupbyDesc doe not have a 'keys' field specified (in other
map side aggregates - i can see the keys specified).
At any rate - the mapper emits one output row for each input row in this case.
This is completely broken ..
> Map-side aggregates output one row per reducer when not grouping
> ----------------------------------------------------------------
>
> Key: HIVE-219
> URL: https://issues.apache.org/jira/browse/HIVE-219
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: David Phillips
> Priority: Blocker
>
> Example: SELECT count(1) FROM table;
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