Hello all,
I have a custom code written inside postgres in an application we use.
The snippet is as below :
Here inner plan is an index scan.
scandesc = ((IndexScanState *)innerPlan)->iss_ScanDesc;
flag=index_getmulti(scandesc, &tidelm->tid, 1, &ret_tids);
Now consider a query like
explain select * from dept,manager where did=id ;
QUERY PLAN
---------------------------------------------------------------------------
Nested Loop (cost=0.00..269.09 rows=45 width=72)
-> seq scan on manager (cost=0.00..6.50 rows=45 width=36)
-> Index Scan using id1 on dept (cost=0.00..5.82 rows=1 width=36)
Index Cond: ("outer".did = dept.id)
Say seq scan retrieves did in the order 30,10, 20.. My doubt is in what order
will index_getmulti return tids. How does the scandesc work ?
Will it return the tids as firstly macthing inners for dept=30, then dept=10 ?
Please help me with this.
Thanks and regards,
Suresh
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