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#' Subset index chunk for processing
#'
#' 'attr' in `[.data.frame` takes too much CPU time
#'
#' @param x Index data.frame
#' @param i Rows to subset
#' @return x[i,]
#' @keywords internal
chunk = function(x, i) {
re = lapply(x, `[`, i=i)
re$` id ` = i
re
}
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