qd_serialize

Serializes an object to a raw vector using the qdata format.

qd_serialize(object,
         compress_level = qopt("compress_level"),
         shuffle = qopt("shuffle"),
         warn_unsupported_types = qopt("warn_unsupported_types"),
         nthreads = qopt("nthreads"))

Arguments

object

The object to save.

compress_level

The compression level used (default: qopt("compress_level"), initial value is 3L.

The maximum and minimum possible values depend on the version of the ZSTD library used. As of ZSTD 1.5.6 the maximum compression level is 22, and the minimum is -131072. Usually, values in the low positive range offer very good performance in terms of speed and compression.

shuffle

Whether to allow byte shuffling when compressing data (default: qopt("shuffle"), initial value is TRUE).

warn_unsupported_types

Whether to warn when saving an object with an unsupported type (default: qopt("warn_unsupported_types"), initial value is TRUE).

nthreads

The number of threads to use when compressing data (default: qopt("nthreads"), initial value is 1L.

Value

The serialized object as a raw vector.

Examples

x <- data.frame(int = sample(1e3, replace=TRUE),
         num = rnorm(1e3),
         char = sample(state.name, 1e3, replace=TRUE),
         stringsAsFactors = FALSE)
xserialized <- qd_serialize(x)
x2 <- qd_deserialize(xserialized)
identical(x, x2) # returns TRUE
#> [1] TRUE