This function read all parquet files in folder argument that starts with output_name,
combine them using rbind and write the result to a new parquet file.
It can also delete the initial files if delete_initial_files argument is TRUE.
Be careful, this function will not work if files with different structures
are present in the folder given with the argument folder.
Usage
rbind_parquet(
folder,
output_name,
delete_initial_files = TRUE,
compression = "snappy",
compression_level = NULL
)Arguments
- folder
the folder where the initial files are stored
- output_name
name of the output parquet file
- delete_initial_files
Boolean. Should the function delete the initial files ? By default TRUE.
- compression
compression algorithm. Default "snappy".
- compression_level
compression level. Meaning depends on compression algorithm.
Examples
if (FALSE) { # \dontrun{
library(arrow)
if (file.exists('output')==FALSE) {
dir.create("output")
}
file.create(fileext = "output/test_data1-4.parquet")
write_parquet(data.frame(
x = c("a","b","c"),
y = c(1L,2L,3L)
),
"output/test_data1-4.parquet")
file.create(fileext = "output/test_data4-6.parquet")
write_parquet(data.frame(
x = c("d","e","f"),
y = c(4L,5L,6L)
), "output/test_data4-6.parquet")
test_data <- rbind_parquet(folder = "output",
output_name = "test_data",
delete_initial_files = FALSE)
} # }