[jira] [Created] (CARBONDATA-996) Incorrect result displays while using var_pop aggregate function in presto integration

["Vandana Yadav (JIRA)" <ji...@apache.org>]

Vandana Yadav created CARBONDATA-996:
----------------------------------------

             Summary: Incorrect result displays while using var_pop aggregate function in presto integration
                 Key: CARBONDATA-996
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-996
             Project: CarbonData
          Issue Type: Bug
          Components: data-query, presto-integration
    Affects Versions: 1.1.0
         Environment: spark 2.1, presto 0.166
            Reporter: Vandana Yadav
            Priority: Minor
         Attachments: 2000_UniqData.csv

Incorrect result displays while using var_pop aggregate function in presto integration

Steps to reproduce :
1. In CarbonData:
a) Create table:
CREATE TABLE uniqdata (CUST_ID int,CUST_NAME String,ACTIVE_EMUI_VERSION string, DOB timestamp, DOJ timestamp, BIGINT_COLUMN1 bigint,BIGINT_COLUMN2 bigint,DECIMAL_COLUMN1 decimal(30,10), DECIMAL_COLUMN2 decimal(36,10),Double_COLUMN1 double, Double_COLUMN2 double,INTEGER_COLUMN1 int) STORED BY 'org.apache.carbondata.format' TBLPROPERTIES ("TABLE_BLOCKSIZE"= "256 MB");
b) Load data : 
LOAD DATA INPATH 'hdfs://localhost:54310/2000_UniqData.csv' into table uniqdata OPTIONS('DELIMITER'=',' , 'QUOTECHAR'='"','BAD_RECORDS_ACTION'='FORCE','FILEHEADER'='CUST_ID,CUST_NAME,ACTIVE_EMUI_VERSION,DOB,DOJ,BIGINT_COLUMN1,BIGINT_COLUMN2,DECIMAL_COLUMN1,DECIMAL_COLUMN2,Double_COLUMN1,Double_COLUMN2,INTEGER_COLUMN1');
2. In presto 
a) Execute the query:
select var_pop(DECIMAL_COLUMN1)  as a from (select DECIMAL_COLUMN1 from UNIQDATA order by DECIMAL_COLUMN1) t

Actual result:
In CarbonData:
"+---------------------+--+
|          a          |
+---------------------+--+
| 333665.66547125275  |
+---------------------+--+
1 row selected (0.85 seconds)
"
In Presto:
"         a         
-------------------
 333665.4683101308 
(1 row)

Query 20170420_082535_00061_hd7jy, FINISHED, 1 node
Splits: 35 total, 35 done (100.00%)
0:00 [2.01K rows, 1.97KB] [7.12K rows/s, 6.97KB/s]
"

Expected result: it should display the same result as showing in CarbonData.



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