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Problem IT43206
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Status: Closed |
LAG() AND LEAD() OLAP RANKING FUNCTIONS CORRUPTING LARGER RESULTSETS WITH IGNORE NULLS
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| product: |
INFORMIX SERVER / 5725A3900 / E10 - |
| Problem description: |
When using LAG() or LEAD() OLAP functions with IGNORE NULLS on a
sufficiently large result set containing NULL values, the result
set would see some of its rows replaced by duplicates of others.
E.g. the following query would produce
select hex(rowid) rowid, *,
lag(c,1) ignore nulls over (order by s) lag_1
from test_tab
order by s;
rowid s c lag_1
0x00000101 1 1
0x00000101 1 1
0x00000102 2 2 1
0x00000102 2 2 1
0x00000103 3 3 2
0x00000103 3 3 2
0x00000104 4 4 3
0x00000104 4 4 3
instead of
rowid s c lag_1
0x00000101 1 1
0x00000102 2 2 1
0x00000103 3 3 2
0x00000104 4 4 3
0x00000105 5 5 4 |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC16 and 14.10.xC11. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC16 or 14.10.xC11 (when *
* available). *
**************************************************************** |
| Local Fix: |
|
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC16 and 14.10.xC11. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC16 or 14.10.xC11 (when *
* available). *
**************************************************************** |
| Comment |
Fixed in Informix Server 12.10.xC16 and 14.10.xC11. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 24.02.2023
18.05.2023
18.05.2023 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
