Potential wrong results using the RTRIM function in Derby 10.0 and Derby 10.1
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Key: DERBY-1877
URL: http://issues.apache.org/jira/browse/DERBY-1877
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.1.3.1, 10.0.2.1
Reporter: Mamta A. Satoor
Attachments: RTRIMreproducibleScript.txt
When RTRIM is added to the following query, it gives incorrect results on Derby
10.0 and Derby 10.1. The same RTRIM query gives correct results when run on
Derby 10.2 (I will attach the reproducible script RTRIMreproducibleScript.txt
to this Jira entry which can be used to demonstrate the problem on Derby 10.0
and Derby 10.1)
Kathey Marsden had started a thread titled "Did DERBY-883 fix this wrong
results bug?" at
http://www.nabble.com/Did-DERBY-883-fix-this-wrong-results-bug--tf2255734.html#a6273521
to track what has changed between Derby 10.1 and Derby 10.2 which has fixed
the problem. There were some responses to that thread but no resolution has
been reached as to what is causing this query to work fine under Derby 10.2
-- Query w/o RTRIM gives correct results
select '' HOUR_INTERVAL,
sum(double(1) / case
when SAMPLE_RATE = 0 then
1
else
SAMPLE_RATE
end) / 3600 THROUGHPUT_PER_SEC,
((char(r.y_t))) || '^' || '^' ||
((char(r.h_t))) XVAL,
'' NA,
'' SORTCOLUMN,
count(*) SAMPLE_COUNT
from (select year(s.END_TIME) y_t,
hour(s.END_TIME) h_t,
day(s.END_TIME) d_t,
month(s.END_TIME) mn_t,
minute(s.END_TIME) mi_t,
s.SAMPLE_RATE
from SAMPLE s) r
GROUP BY r.y_t, r.h_t
ORDER BY r.y_t, r.h_t;
-- INCORRECT results with the following RTRIM query in Derby 10.1 and Derby
10.0 --
select '' HOUR_INTERVAL,
sum(double(1) / case
when SAMPLE_RATE = 0 then
1
else
SAMPLE_RATE
end) / 3600 THROUGHPUT_PER_SEC,
rtrim((char(r.y_t))) || '^' || '^' ||
rtrim((char(r.h_t))) XVAL,
'' NA,
'' SORTCOLUMN,
count(*) SAMPLE_COUNT
from (select year(s.END_TIME) y_t,
hour(s.END_TIME) h_t,
day(s.END_TIME) d_t,
month(s.END_TIME) mn_t,
minute(s.END_TIME) mi_t,
s.SAMPLE_RATE
from SAMPLE s) r
GROUP BY r.y_t, r.h_t
ORDER BY r.y_t, r.h_t;
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