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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/19216/
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(Updated March 14, 2014, 8:41 a.m.)
Review request for hive, Eric Hanson and Remus Rusanu.
Bugs: HIVE-6664
https://issues.apache.org/jira/browse/HIVE-6664
Repository: hive-git
Description
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Following query can show the difference:
select var_samp(ss_sales_price), var_pop(ss_sales_price),
stddev_pop(ss_sales_price), stddev_samp(ss_sales_price) from store_sales.
The reason for the difference is that row mode converts the decimal value to
double upfront to calculate sum of values, when computing variance. But the
vector mode performs local aggregate sum as decimal and converts into double
only at flush.
Diffs
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ql/src/gen/vectorization/UDAFTemplates/VectorUDAFVarDecimal.txt c5af930
ql/src/test/results/clientpositive/vector_decimal_aggregate.q.out 507f798
Diff: https://reviews.apache.org/r/19216/diff/
Testing
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Thanks,
Jitendra Pandey
