keypos returns the positions of the (fact table) elements that participate in their sorted unique subset (dimension table)
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a vector or a data frame or an array or
NULL for automatic method selection or a suitable low-level method, see details
NAs are sorted first in the dimension table, see
This function automatically chooses from several low-level functions considering the size of
x and the availability of a cache.
Suitable methods are
sortorderkey (fast ordering)
orderkey (memory saving ordering).
an integer vector of the same length as codex containing positions relativ to codesort(unique(x), na.last=FALSE)
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
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