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Informix - Problem description

Problem IT33537 Status: Closed

UNEXPECTED INTERNAL ERROR 172 RUNNING MERGE STATEMENT USING SUBQUERIES

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
A MERGE statement involving multiple subqueries may fail with
error 959 / 172 when a join condition exists that connects the
two subqueries.

An example statement:

MERGE INTO target t USING
( SELECT mnum, cref FROM source ) x
ON t.num = x.mnum
WHEN MATCHED THEN UPDATE
  SET code =
  (SELECT code FROM ref WHERE cref = x.cref);

An Assert Failure is generated which includes a thread stack
similar to:

ld_newvals_in2tmpbuf
subqcache_find
chkrmk
exsubq
ev_cb
new_eval
eval_projection_list
dodmlrow
process_upsert
upsert_next
doupsert
excommand
sq_execute
sqmain
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC5.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC5.                                                   *
****************************************************************
Local Fix:
a workaround can be using a view for the target table:

create view vt as (select num, code from target);
merge into vt t using
...
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
14.07.2020
18.01.2021
18.01.2021
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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