[MCOL-4429] REGR_R2() results differ when compared to Innodb Created: 2020-12-02  Updated: 2021-01-15

Status: Open
Project: MariaDB ColumnStore
Component/s: None
Affects Version/s: 5.5.1
Fix Version/s: Icebox

Type: Bug Priority: Major
Reporter: Bharath Bokka (Inactive) Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Relates
relates to MCOL-4431 regr_r2() and corr() outputs differ f... Closed

 Description   

Artifacts: https://cspkg.s3.amazonaws.com/index.html?prefix=develop-1.5/cron/1233/centos7/

Columnstore:

CREATE TABLE t1 (x INT, y MEDIUMINT)ENGINE=Columnstore;
 
INSERT INTO t1 VALUES (20, 1),(39, 2),(48, 3),(57, 4),(66, 5),(75, 6),(84, 7);
 
SELECT REGR_R2(y, x) FROM t1;
 
+--------------------+
 
| REGR_R2(y, x)      |
 
+--------------------+
 
| 0.9814869668246446 |
 
+--------------------+

Innodb:

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (x INT, y MEDIUMINT);
 
INSERT INTO t1 VALUES (20, 1),(39, 2),(48, 3),(57, 4),(66, 5),(75, 6),(84, 7);
 
SELECT REGR_R2(y, x) FROM t1;
 
+--------------------+
 
| REGR_R2(y, x)      |
 
+--------------------+
 
| 0.9814869668246445 |
 
+--------------------+

The same matches with Innodb results for builds under develop branch-
https://cspkg.s3.amazonaws.com/index.html?prefix=develop/cron/1232
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