Comments (4)
Yeah, exactly, not "sad" at all given that tsv-utils
didn't exist back then.
Moreover, I wanted to work with csv, not tsv. tsv-utils does come with its own csv2tsv
utility, so I'd have to run that first:
[andrew@duff openpolicing]$ time xsv count MA-clean.csv
3418298
real 0.449
user 0.411
sys 0.037
maxmem 5 MB
faults 0
[andrew@duff openpolicing]$ time csv2tsv MA-clean.csv | wc -l
3418299
real 0.548
user 0.421
sys 0.114
maxmem 5 MB
faults 0
real 0.548
user 0.008
sys 0.064
maxmem 5 MB
faults 0
So yeah, it looks decently fast.
While I don't know how tsv-utils
works, it's worth noting that tsv data is commonly assumed to not have quoted data and that it simply does not contain delimiters at all:
By itself, using different field delimiters is not especially significant. Far more important is the approach to delimiters occurring in the data. CSV uses an escape syntax to represent commas and newlines in the data. TSV takes a different approach, disallowing TABs and newlines in the data.
And thus:
By contrast, parsing TSV data is simple.
And indeed, this is a categorical difference and opens up many more optimization techniques that simply aren't available for csv data.
So, you might say, "well just convert all your CSV files to TSV." Nope. Non-starter. CSVs can encode any kind of arbitrary data. But as mentioned above, TSVs as implemented by tsv-utils
cannot. They cannot handle cases where tabs and newlines occur inside a field. Even its csv2tsv tool admits to this, and will replace those characters with spaces by default, thereby making the conversion lossy.
So tsv-utils
is great if you have TSV data. I did not. I had CSV and that CSV was not clean and nice. tsv-utils
, even if it existed back then, wouldn't have worked for me.
from xsv.
My bad, xsv started 2 years before that one.
from xsv.
I see. It makes sense now. Many things tend to look simple only at first glance.
from xsv.
Indeed. I've learned that same lesson many times.
from xsv.
Related Issues (20)
- Auto-detect delimiter
- Idea: Literally embed SQLite into xsv HOT 1
- Completions
- feature request: write stdout to pager command
- Please add Contributing.md HOT 2
- --compress-program option for xsv split? HOT 4
- Ignore bad lines instead of crashing HOT 3
- Investigate increasing Maintainer Productivity with Pull Requests Environments HOT 1
- "@list" external parameter list
- Split a column
- xsv fixlengths never finishes on some input HOT 1
- How to avoid extra quotes HOT 1
- Is it possible to generate a new csv from the associated fields of two csv's? HOT 2
- Use file name patterns in cat HOT 1
- New build needed for `reverse`
- Scanning of "cargo-geiger" showed unsafe code HOT 1
- xsv might silently fail
- Cargo test failed on Windows
- fixlengths -- insert extra commas not at end
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from xsv.