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    Tom Lane authored
    is a large enough histogram, it will use the number of matches in the
    histogram to derive a selectivity estimate, rather than the admittedly
    pretty bogus heuristics involving examining the pattern contents.  I set
    'large enough' at 100, but perhaps we should change that later.  Also
    apply the same technique in contrib/ltree's <@ and @> estimator.  Per
    discussion with Stefan Kaltenbrunner and Matteo Beccati.
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