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

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Component/s: data-query, presto-integration
• Environment: spark 2.1, presto 0.166
• Assignee: Unassigned
• Reporter: Vandana Yadav
• Created: 27/Apr/17 06:32
• Updated: 31/Jul/18 12:44
• Resolved: 31/Jul/18 12:44

Description

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.