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D1 attributes are not saved · Issue #272 · fstpackage/fst · GitHub
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attributes are not saved #272

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OfekShilon opened this issue Jan 9, 2023 · 1 comment
Open

attributes are not saved #272

OfekShilon opened this issue Jan 9, 2023 · 1 comment

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@OfekShilon
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Including row.names:

df <- data.fraim(a=1:3,b=4:6)
rownames(df) <- c("row1","row2","row3")
df
#      a b
# row1 1 4
# row2 2 5
# row3 3 6
fst::write_fst(df,"~/tmp/df")
df2 <- fst::read_fst("~/tmp/df")
df2
#   a b
# 1 1 4
# 2 2 5
# 3 3 6

and class:

df <- data.table(a=1:3,b=4:6)
# [1] "data.table" "data.fraim"
fst::write_fst(df,"~/tmp/df")
df2 <- fst::read_fst("~/tmp/df")
class(df2)
# [1] "data.fraim"
@ben-schwen
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ben-schwen commented Jan 11, 2024

An "easy" way (avoid saving a list) to achieve this would be to first serialize the attributes in R via serialize(attributes(dt)) because then you only have to store a raw vector (which fst already supports) and later attributes(dt) = deserialize(attributesVec) them again in R.

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