VACUUM ANALYZE AND ANALYZE ISSUE

Hi,

I was running vacuum analyze on one of heavily bloated table.
After the vacuum analyze completed . I did explain on a query .
It was going for hash join and sequential scan.

Then i issues ANALYZE BLOATED_TABLE;

Then when ran explain query , surprisingly it was going for index scan .

This was observed in postgres 9.0.1.
Ideally VACUUM ANALYSE must have done VACCUM + ANALYZE. But ANALYZE part was
pending. Which was completed when i ran analyze on that table .

Can any one explain this? Did i miss anything.

Rgrds
Suhas

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