Write to parquet file

Description

Usage

<DataFrame>$write_parquet(
  file,
  ...,
  compression = "zstd",
  compression_level = 3,
  statistics = FALSE,
  row_group_size = NULL,
  data_pagesize_limit = NULL
)

Arguments

`file`	File path to which the result should be written.
`…`	Ignored.
`compression`	String. The compression method. One of: "lz4": fast compression/decompression. "uncompressed" "snappy": this guarantees that the parquet file will be compatible with older parquet readers. "gzip" "lzo" "brotli" "zstd": good compression performance.
`compression_level`	`NULL` or Integer. The level of compression to use. Only used if method is one of ‘gzip’, ‘brotli’, or ‘zstd’. Higher compression means smaller files on disk: "gzip": min-level: 0, max-level: 10. "brotli": min-level: 0, max-level: 11. "zstd": min-level: 1, max-level: 22.
`statistics`	Logical. Whether compute and write column statistics. This requires extra compute.
`row_group_size`	`NULL` or Integer. Size of the row groups in number of rows. If `NULL` (default), the chunks of the DataFrame are used. Writing in smaller chunks may reduce memory pressure and improve writing speeds.
`data_pagesize_limit`	`NULL` or Integer. If `NULL` (default), the limit will be ~1MB.

Value

Invisibly returns the input DataFrame.

Examples

library(polars)

# write table 'mtcars' from mem to parquet
dat = pl$DataFrame(mtcars)

destination = tempfile(fileext = ".parquet")
dat$write_parquet(destination)