The ideal thing would be for GIN to return a count of the number of
distinct heap tuples referenced by the entries in the index, but I
suppose that would be impractical for VACUUM to compute.

Of course, in this case we should collect heap pointers in memory..

--
Teodor Sigaev                                   E-mail: [EMAIL PROTECTED]
                                                   WWW: http://www.sigaev.ru/

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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
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