ERROR: could not open relation with OID 59132 - Mailing list pgsql-general

Hello ,

after google search i havent found any solution or clue for this specific case:

Background:
Postgresql: 8.3.0


select version();
                                          version
--------------------------------------------------------------------------------------------
 PostgreSQL 8.3.0 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.2.1 (SUSE Linux)


I have a master table(sms_new) and few child tables(sms_new_$date) inherited from it.

Problem is I am dropping 8 days old partition and at the same time a select runs on master but for different partition range that is greater than last 2 days.

constraint exclusion is ON.

But this select query fails giving the above error.

As per my understanding with constraint exclusion on select should not even care for 8 days old table i.e. it should not include it in plan.

Here the specific case is master is quired  with id > 20091208 criteria for SELECT  and I am dropping table 20091130

 Table is partitioned on deliveryid.

Here are the logs:

2009-12-09 03:55:08 IST [16481]: [1-1] LOG:  duration: 3142605.157 ms 
statement: drop table sms_new_20091130;
2009-12-09 03:55:08 IST [2984]: [1-1] ERROR:  could not open relation
with OID 59132
2009-12-09 03:55:08 IST [2984]: [2-1] STATEMENT:  select min(smsnewseq)
from sms_new where deliveryid >=20091208000000000 limit 1
2009-12-09 03:55:08 IST [14689]: [1-1] ERROR:  couldnot open relation
with OID 59132
2009-12-09 03:55:08 IST [14689]: [2-1] STATEMENT:  select min(smsnewseq)
from sms_new where deliveryid >=20091208000000000 limit 1
2009-12-09 03:55:08 IST [28102]: [8711-1] ERROR:  could not open
relation with OID 59132
2009-12-09 03:55:08 IST [28102]: [8712-1] STATEMENT:  select
deliveryid,mobile,gateway,otid,account,smsnewseq,feedtype,recvtime,otid_seq,partid,seq
from sms_new  where smsnewseq in
(7669097743,7669097744,7669097745,7669097754,7669097755,7669097756,7669097757,7669097836,7669097837,7669097838,7669097845,7669097846,7669097871,7669097872,7669097873,7669097906,7669097907,7669097908,7669097929,7669097930,7669097931,7669097944,7669097960,7669097961,7669097962,7669097963,7669097964,7669097976,7669097977,7669097987,7669097988)
and feedtype in (4,6,7,8,9,12) and deliveryid >20091206000000000
2009-12-09 03:55:08 IST [18969]: [7-1] ERROR:  could not open relation
with OID59132
2009-12-09 03:55:08 IST [18969]: [8-1] STATEMENT:  select
reqid,message,createddate,applicationid,gatewayid,deliverytype,fromtext,priority,url,keyword,ad,taskid,itemtags,otid,account,n.smsnewseq,d.deliveryid,n.otid,n.seq,n.mobile,d.feedid,d.itemid,d.feedtype
,lengthinbytes,recvtime from delivery d, sms_new n where d.deliveryid =
n.deliveryid and n.smsnewseq > $1 and not exists (select '1' from
ent_status where n.smsnewseq = ent_status.smsnewseq) and gateway in
(2,6,8,9) and  d.deliveryid >= 20091208000000000 and n.deliveryid >=
20091208000000000 and d.feedtype in (4,6,7,8,9) and n.otid like
'%-%-%-%-%' and dlrreport=true limit 20000

Can anybody please share some light on it..

Thanks in advance

--Anil