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Problem IC89439
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Status: Closed |
QUERY MIGHT FAIL WITH SQL0901N - BAD PLAN, UNRESOLVED QNC FOUND |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
Under rare scenarios, DB2 might return a SQL0901N error message
if the following conditions are satisfied:
Scenario 1:
1. Query has an OR predicate
2. One of the subterms contains a complex expression with a
negation.
eg. NOT CAST (cast('abcd' as CHAR(188)) AS CHARACTER (188)) >=
TRANSLATE(CAST (cast('xyz' as CHAR(87)) AS CHAR (87)))
Scenario 2:
1. The query has a case expression as one of the output columns
2. The case expression contains a complex expression with a
negation.
eg.
SELECT
CASE
WHEN NOT CAST (cast('abcd' as CHAR(188)) AS CHARACTER (188)) >=
SUBSTR (CAST (cast('xyz' as CHAR(87)) AS CHAR (87)), 82, 1)
THEN c1
ELSE c1 end
from t1;
Error Message:
SQL0901N: Bad Plan; Unresolved QNC found
Stack:
sqlng_process_parse_tree_node
sqlng_process_BF_node
sqlng_process_parse_tree_node
sqlng_process_BF_node
sqlng_process_parse_tree_node
sqlng_process_BF_node
sqlng_walk_BF_chain
sqlng_build_thread
sqlng_build_TA_op
sqlng_process_f_iscan
sqlng_process_fetch_op |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Please upgrade to DB2 version 101 fix pack 3 *
**************************************************************** |
| Local Fix: |
Manually rewrite the query to perform De Morgan's Law |
| available fix packs: |
DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
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| Solution |
Fix was included in DB2 version 101 fix pack 3 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 09.01.2013
07.10.2013
07.10.2013 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.1.0.3
|
 |
| 10.1.0.3
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