btree_gin uses SEQ_MINVALUE as a way to get the smallest int64 value.
This is actually wrong because the smallest int64 value is
SEQ_MINVALUE-1, so this might be slightly broken.
The whole thing was done as a convenience when INT64_IS_BUSTED had to be
considered, but I think we can get rid of that now. See attached
proposed patch.
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services