Zoltan Haindrich created HIVE-20286:
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Summary: Estimate special groupby modes
Key: HIVE-20286
URL: https://issues.apache.org/jira/browse/HIVE-20286
Project: Hive
Issue Type: Improvement
Components: Statistics
Reporter: Zoltan Haindrich
not sure if its handled already..but it looks like there is some
underestimation; if the groups are not counted in - that could lead to serious
underestimation if there are a lot of groups
{code}
ql/src/test/results/clientpositive/llap/vector_groupby_grouping_sets2.q.out
SELECT a, b, sum(c+d) from T2_n42 group by a, b with cube
{code}
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