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trait StatsBasedEstimator extends AnyRef

Estimate query counts based on cached stats.

Although this trait only requires a generic GeoMesaStats implementation mixin, it has been written based on MetadataBackedStats. In particular, getCount(Filter.INCLUDE) is expected to look up the stat and not invoke any methods in this trait. Also, only Frequency and Z3Histograms are split out by time interval, so filters are only passed in when reading those two types.

Self Type
StatsBasedEstimator with GeoMesaStats
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MetadataBackedStats
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  8. def estimateCount(sft: SimpleFeatureType, filter: Filter): Option[Long]

    Estimates the count for a given filter, based off the per-attribute metadata we have stored

    Estimates the count for a given filter, based off the per-attribute metadata we have stored

    sft

    simple feature type

    filter

    filter to apply - should have been run through QueryPlanFilterVisitor so all props are right

    returns

    estimated count, if available

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