Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/427#issuecomment-87540688
Hi @sirpkt, thanks for your patch.
I executed the same queries in newly added unit tests with pgsql, but got
different results.
Would you check it? Here are the results of pgsql.
* result of testStdDevPop1
```
linenumber_stddev_pop | suppkey_stddev_pop | extendedprice_stddev_pop |
discount_stddev_pop
------------------------+--------------------+--------------------------+---------------------
0 | 0 | 0 |
0
0.50000000000000000000 | 197.500000000000 | 12407.465 |
0.0250000022351742
0 | 0 | 0 |
0
0 | 0 | 0 |
0
0.50000000000000000000 | 2371.000000000000 | 3630.79000000004 |
0.0200000014156103
(5 rows)
```
* result of testStdDevSamp1
```
linenumber_stddev_samp | suppkey_stddev_samp | extendedprice_stddev_samp |
discount_stddev_samp
------------------------+---------------------+---------------------------+----------------------
| | |
0.70710678118654752440 | 279.307178568686 | 17546.8052776695 |
0.035355342220341
| | |
| | |
0.70710678118654752440 | 3353.100356386608 | 5134.71246012867 |
0.0282842732494372
(5 rows)
```
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