Fread bug in reading file with quotes
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 38/100
Research direction
Start by running the supplied data.table, fwrite, readLines, and fread reproducer with the quoted CSV. Trace fread's handling of quoted headers and fields, then verify that the file is read with one column and without the reported warnings.
Written by the indexing model from the issue text.
Description
require(data.table) # today's devel
(dt <- data.table(my_col = Sys.time()))
# my_col
# 1: 2020-01-31 19:43:48
fwrite(dt, file="~/Downloads/tmp.csv", quote=TRUE, dateTimeAs="write.csv")
readLines("~/Downloads/tmp.csv")
# [1] "\"my_col\"" "\"2020-01-31 19:43:48\""
fread("~/Downloads/tmp.csv")
# V1 "my_col"
# 1: "2020-01-31 19:43:48"
# Warning messages:
# 1: In fread("~/Downloads/tmp.csv") :
# Found and resolved improper quoting in first 100 rows. If the fields are not quoted (e.g. field separator does not appear within any field), try quote="" to avoid this warning.
# 2: In fread("~/Downloads/tmp.csv") :
# Detected 1 column names but the data has 2 columns (i.e. invalid file). Added 1 extra default column name for the first column which is guessed to be row names or an index. Use setnames() afterwards if this guess is not correct, or fix the file write command that created the file to create a valid file.
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