duan xiong created CALCITE-4924:
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Summary: The COVAR aggregate function returns a wrong data type
Key: CALCITE-4924
URL: https://issues.apache.org/jira/browse/CALCITE-4924
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.28.0
Reporter: duan xiong
According agg.iq unit test:
{code:java}
# [CALCITE-1776, CALCITE-2402] REGR_SXX, REGR_SXY, REGR_SYY
SELECT
regr_sxx(COMM, SAL) as "REGR_SXX(COMM, SAL)",
regr_syy(COMM, SAL) as "REGR_SYY(COMM, SAL)",
regr_sxx(SAL, COMM) as "REGR_SXX(SAL, COMM)",
regr_syy(SAL, COMM) as "REGR_SYY(SAL, COMM)"
from "scott".emp; {code}
This SQL top physical is:
{code:java}
EnumerableCalc(expr#0..5=[{inputs}], expr#6=[CAST($t0):DECIMAL(7, 2)],
expr#7=[0], expr#8=[=($t2, $t7)], expr#9=[null:INTEGER], expr#10=[*($t1, $t1)],
expr#11=[/($t10, $t2)], expr#12=[CASE($t8, $t9, $t11)],
expr#13=[CAST($t12):DECIMAL(7, 2)], expr#14=[-($t6, $t13)],
expr#15=[CAST($t14):DECIMAL(7, 2)], expr#16=[CAST($t3):DECIMAL(7, 2)],
expr#17=[=($t5, $t7)], expr#18=[*($t4, $t4)], expr#19=[/($t18, $t5)],
expr#20=[CASE($t17, $t9, $t19)], expr#21=[CAST($t20):DECIMAL(7, 2)],
expr#22=[-($t16, $t21)], expr#23=[CAST($t22):DECIMAL(7, 2)], REGR_SXX(COMM,
SAL)=[$t15], EXPR$1=[$t23], REGR_SXX(SAL, COMM)=[$t23], REGR_SYY(SAL,
COMM)=[$t15]) {code}
The result data type should be DECIMAL(7, 2). But the asserted result is:
{noformat}
+---------------------+---------------------+---------------------+---------------------+
| REGR_SXX(COMM, SAL) | REGR_SYY(COMM, SAL) | REGR_SXX(SAL, COMM) |
REGR_SYY(SAL, COMM) |
+---------------------+---------------------+---------------------+---------------------+
| 95000.0000 | 1090000.0000 | 1090000.0000 |
95000.0000 |
+---------------------+---------------------+---------------------+---------------------+
(1 row){noformat}
Actually, this result value can't fit in DECIMAL(7, 2).
The Postgresql about this aggregation functions in
[agg-functions|https://www.yiibai.com/manual/postgresql/functions-aggregate.html].
And I have tested the result is right.
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