Retrieve the REF length for the specified VariantKey. Return REF length or 0 if the VariantKey is not reversible and not found.

Retrieve the REF length for the specified VariantKey. Return REF length or 0 if the VariantKey is not reversible and not found.

GetVariantKeyRefLength(vk, mc = vk.env$nrvk_$MC)

Arguments

vk	VariantKey.
mc	Memory-mapped columns object as retured by MmapNRVKfile.