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Return the column names of the disk.frame
colnames(x, ...)# S3 method for disk.frame names(x, ...)# S3 method for disk.frame colnames(x, ...)# S3 method for default colnames(x, ...)
# S3 method for disk.frame names(x, ...)
# S3 method for disk.frame colnames(x, ...)
# S3 method for default colnames(x, ...)
a disk.frame
not used