Remus Rusanu created HIVE-6614: ---------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.2#6252)