In response to Yan Cheng Cheok :
> As you can see, their select statement is the same. Except stored
> procedure is having additional 'QUERY'. Does that make the speed
> difference?
No. The problem is, the planner don't know the actual parameters.
Therefore the planner picked out a wrong plan (seq-scan instead of
index-scan). You can avoid this by rewrite your function: use a dynamic
query, use EXECUTE.
Read more:
http://www.postgresql.org/docs/8.4/interactive/plpgsql-control-structures.html
Chapter 38.6.1.2. RETURN NEXT and RETURN QUERY
Andreas
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Andreas Kretschmer
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