feature_overlaps(integer)

SELECT feature.*

  FROM feature

   INNER JOIN featureloc AS x ON (x.feature_id=feature.feature_id)

   INNER JOIN featureloc AS y ON (y.feature_id=$1)

  WHERE

   x.srcfeature_id = y.srcfeature_id            AND

   ( x.fmax >= y.fmin AND x.fmin <= y.fmax )