fwrite crashes when a long line is encountered out of sample
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 38/100
Research direction
Start by running the provided R MRE and observe the verbose fwrite failure with lines exceeding the default 8MB buffer. Trace the fwrite implementation's handling of long or out-of-sample lines, then add a regression test covering the reproduced input. Done means fwrite writes the data without crashing.
Written by the indexing model from the issue text.
Description
MRE:
require(data.table)
DT = data.table(A=rep('foo', 10000))
DT[1111, A:=paste(rep('b',1e7), collapse='')]
DT[1112, A:=paste(rep('b',1e7), collapse='')]
fwrite(DT, 'temp.csv', verbose=TRUE)
For this error to occur, a single line has to be over 8MB (the default buffer's size). Or multiple lines (out of sample) have to have their total length over 8MB. Overall, the likelihood is quite rare
- Dominant language
- R
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- Merged PRs (30d)
- 4
Contributor guide
First steps
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