The following bug has been logged online:

Bug reference: 1849
Logged by: Bernard Henry Voynet
Email address: bhv (AT) quebecemail (DOT) com
PostgreSQL version: 8.0.3
Operating system: Windows XP
Description: Is PgOleDb still alive ?
Details:

Since this project has no new release since March even though bugs that have
been reported makes it unusable, I was wondering whether it is still alive
or not ? Whether it is still part of PostgresSQL ?

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match