[fread] broken functionality in 1.9.6

[ziyadsaeed]

fread from v1.9.4 gives correct results but fread from dev 1.9.5 doesn't.
For eg

create a test.csv file

cat("V1, V2, V3
1,2,3
V4, V5, V6, V7
4,5,6,7
8,9,10,11",
    file = "test.csv"
)

Notice there are different number of columns
fread from 1.9.4

fread("test.csv", nrows = 1, header = TRUE, skip = 0)
V1 V2 V3
1:  1  2  3

This is what I want

But in fread from v1.9.5

     fread("test.csv", nrows = 1, header = TRUE, skip = 0)
    V4 V5 V6 V7
    1:  4  5  6  7
    Warning messages:
    1: In fread("test.csv", nrows = 1, header = TRUE, skip = 0) :
     Starting data input on line 3 and discarded previous non-empty line: 1,2,3
    2: In fread("test.csv", nrows = 1, header = TRUE, skip = 0) :
    Stopped reading at empty line 5 but text exists afterwards (discarded): 8,9,10,11

Not the expected result.

[ziyadsaeed]

Minimum reproducible code is now added.

[ziyadsaeed]

This bug has now been released in v1.9.6.

[jangorecki]

@ziyadsaeed you can self-close resolved issue, OK

[ziyadsaeed]

it isn't resolved. I'm mentioning that this bug was not fixed in the dev version and now the release version 1.9.6 has this bug.

[arunsrinivasan]

The default behaviour is right as it is. I'd expect skip=0 explicitly to work as you intend however.

[ziyadsaeed]

what is the workaround to ask fread to just read the first line.
When 1.9.6 was released it should be mentioned somewhere that it breaks existing functionality from 1.9.4 and a workaround should have been mentioned.