fst | R Documentation |
An API for reading fst file as data.table.
parse_fst(path) slice_fst(ft, row_no) select_fst(ft, ...) filter_fst(ft, ...) summary_fst(ft)
path |
path to fst file |
ft |
An object of class fst_table, returned by |
row_no |
An integer vector (Positive) |
... |
The filter conditions |
summary_fst
could provide some basic information about
the fst table.
parse_fst
returns a fst_table class.
select_fst
and filter_fst
returns a data.table.
fst
, metadata_fst
# write the file first path = tempfile(fileext = ".fst") fst::write_fst(iris,path) # parse the file but not reading it parse_fst(path) -> ft ft class(ft) lapply(ft,class) names(ft) dim(ft) summary_fst(ft) # get the data by query ft %>% slice_fst(1:3) ft %>% slice_fst(c(1,3)) ft %>% select_fst(Sepal.Length) ft %>% select_fst(Sepal.Length,Sepal.Width) ft %>% select_fst("Sepal.Length") ft %>% select_fst(1:3) ft %>% select_fst(1,3) ft %>% select_fst("Se") # return a warning with message ft %>% select_fst("nothing") ft %>% select_fst("Se|Sp") ft %>% select_fst(cols = names(iris)[2:3]) ft %>% filter_fst(Sepal.Width > 3) ft %>% filter_fst(Sepal.Length > 6 , Species == "virginica") ft %>% filter_fst(Sepal.Length > 6 & Species == "virginica" & Sepal.Width < 3)
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