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Problem IT36320
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Status: Closed |
QUERY EXECUTION MAY FAIL FOR OUTER JOIN QUERIES WITH PREDICATES WITH CAST FUNCTIONS
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| product: |
DB2 FOR LUW / DB2FORLUW / B50 - DB2 |
| Problem description: |
If you have a DPF system and a query that meets the following
conditions :
- query references multiple Outer joins
- predicates in the ON clause reference Cast functions
it may trap in sqlnr_OJ_semi_join()
Example query:
SELECT T1.C1
FROM T1 LEFT OUTER JOIN T2 ON T2.C1 = 'ITRA'
LEFT OUTER JOIN T3 ON T3.C1 = CAST(T1.C1 AS VARCHAR(200)) ;
Example stack trace for the failing query:
sqlnr_OJ_semi_join
sqlnr_qrwprep_phase2
sqlnr_prep2_action
sqlnr_exe
sqlnn_cmpl |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* all *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to 11.5.6 or later *
**************************************************************** |
| Local Fix: |
Set the following registry
- with the optimization guideline to the affected queries:
/*
*/
or
- at the instance level:
db2set DB2COMPOPT=NOOJSJ -im |
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* all *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to 11.5.6 or later *
**************************************************************** |
| Comment |
Upgrade to 11.5.6 or later |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 23.03.2021
21.06.2021
21.06.2021 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
