Remus Rusanu created HIVE-6614:
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Summary: Vectorized aggregates computed on map side diffe (hash
mode) from values computed on reduce side (streaming mode)
Key: HIVE-6614
URL: https://issues.apache.org/jira/browse/HIVE-6614
Project: Hive
Issue Type: Bug
Reporter: Remus Rusanu
Assignee: Remus Rusanu
Priority: Critical
HIVE-6222 allows vectorized aggregates to operate on streaming mode, ie. flush
after each key change and let the shuffle+reduce side to compute the final
aggregate values. An error in patch .2 for HIVE-6222 shows that when the
queries run in streaming mode, there are rounding diffs for some agg functions
(VAR and friends). These occurred for non-decimal types, like ctinyint:
{code}
select csmallint, VAR_POP(ctinyint) from alltypesorc where csmallint = -75
group by csmallint;
{code}
This produces 107.55555555555556 vs. 107.55555555555554.
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