[ 
https://issues.apache.org/jira/browse/HIVE-25653?focusedWorklogId=677395&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-677395
 ]

ASF GitHub Bot logged work on HIVE-25653:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Nov/21 19:47
            Start Date: 05/Nov/21 19:47
    Worklog Time Spent: 10m 
      Work Description: ashish-kumar-sharma commented on a change in pull 
request #2760:
URL: https://github.com/apache/hive/pull/2760#discussion_r743388404



##########
File path: ql/src/test/queries/clientpositive/sdtdev.q
##########
@@ -0,0 +1,12 @@
+create table test ( col1 decimal(10,3) );
+insert into test values 
(10230.72),(10230.72),(10230.72),(10230.72),(10230.72),(10230.72),(10230.72);
+select STDDEV_SAMP(col1) AS STDDEV_6M , STDDEV(col1) as STDDEV 
,STDDEV_POP(col1) as STDDEV_POP , variance(col1) as variance,var_pop(col1) as 
var_pop,var_samp(col1) as var_samp from test;
+
+create table testpoint ( col1 decimal(10,3));
+insert into testpoint values 
(0.12345678),(0.25362123),(0.62437485),(0.65133746),(0.98765432),(0.12435647),(0.7654321445);
+select STDDEV_SAMP(col1) AS STDDEV_6M , STDDEV(col1) as STDDEV 
,STDDEV_POP(col1) as STDDEV_POP , variance(col1) as variance,var_pop(col1) as 
var_pop,var_samp(col1) as var_samp from testpoint;
+
+create table testint(col1 int);
+insert into testint values 
(85),(86),(100),(76),(81),(93),(84),(99),(71),(69),(93),(85),(81),(87),(89);
+select STDDEV_SAMP(col1) AS STDDEV_6M , STDDEV(col1) as STDDEV 
,STDDEV_POP(col1) as STDDEV_POP, variance(col1) as variance,var_pop(col1) as 
var_pop,var_samp(col1) as var_samp from testint;
+

Review comment:
       Done

##########
File path: ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFStd.java
##########
@@ -90,7 +92,9 @@ public GenericUDAFEvaluator getEvaluator(TypeInfo[] 
parameters)
      * use it, etc.
      */
     public static double calculateStdResult(double variance, long count) {
-      return Math.sqrt(variance / count);
+      BigDecimal bvariance = new BigDecimal(variance);
+      BigDecimal result = bvariance.divide(new BigDecimal(count));
+      return Math.sqrt(result.doubleValue());

Review comment:
       Done




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 677395)
    Time Spent: 40m  (was: 0.5h)

> Precision problem in STD, STDDDEV_SAMP,STDDEV_POP
> -------------------------------------------------
>
>                 Key: HIVE-25653
>                 URL: https://issues.apache.org/jira/browse/HIVE-25653
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ashish Sharma
>            Assignee: Ashish Sharma
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Description
> *Script*- 
> create table test ( col1 int );
> insert into values 
> ('10230.72'),('10230.72'),('10230.72'),('10230.72'),('10230.72'),('10230.72'),('10230.72');
> select STDDEV_SAMP(col1) AS STDDEV_6M , STDDEV(col1) as STDDEV 
> ,STDDEV_POP(col1) as STDDEV_POP from test;
> *Result*- 
> STDDDEV_SAMP                            STDDEV                      
> STDDEV_POP 
> 5.940794514955821E-13     5.42317860890711E-13         5.42317860890711E-13
> *Expected*- 
> STDDDEV_SAMP                            STDDEV                      
> STDDEV_POP 
> 0                                                           0                 
>                0



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