CSV dataset file format

ACSVFileFormat is aFileFormat subclass which holds information about how toread and parse the files included in a CSVDataset.

Value

ACsvFileFormat object

Factory

CSVFileFormat$create() can take options in the form of lists passed through asparse_options,read_options, orconvert_options parameters. Alternatively, readr-style options can be passedthrough individually. While it is possible to pass inCSVReadOptions,CSVConvertOptions, andCSVParseOptionsobjects, this is not recommended as options set in these objects are not validated for compatibility.

See also

Examples

# Set up directory for examplestf<-tempfile()dir.create(tf)on.exit(unlink(tf))df<-data.frame(x=c("1","2","NULL"))write.table(df,file.path(tf,"file1.txt"), sep=",", row.names=FALSE)# Create CsvFileFormat object with Arrow-style null_values optionformat<-CsvFileFormat$create(convert_options=list(null_values=c("","NA","NULL")))open_dataset(tf, format=format)#> FileSystemDataset with 1 csv file#> 1 columns#> x: int64# Use readr-style optionsformat<-CsvFileFormat$create(na=c("","NA","NULL"))open_dataset(tf, format=format)#> FileSystemDataset with 1 csv file#> 1 columns#> x: int64