infer_nanoarrow_ptype: Infer an R vector prototype

In nanoarrow: Interface to the 'nanoarrow' 'C' Library

Infer an R vector prototype

Description

Resolves the default to value to use in convert_array() and convert_array_stream(). The default conversions are:

Usage

infer_nanoarrow_ptype(x)

Arguments

x	A nanoarrow_schema, nanoarrow_array, or nanoarrow_array_stream.

Details

• null to vctrs::unspecified()

• boolean to logical()

• int8, uint8, int16, uint16, and int13 to integer()

• uint32, int64, uint64, float, and double to double()

• string and large string to character()

• struct to data.frame()

• binary and large binary to blob::blob()

• list, large_list, and fixed_size_list to vctrs::list_of()

• time32 and time64 to hms::hms()

• duration to difftime()

• date32 to as.Date()

• timestamp to as.POSIXct()

Additional conversions are possible by specifying an explicit value for to. For details of each conversion, see convert_array().

Value

An R vector of zero size describing the target into which the array should be materialized.

Examples

infer_nanoarrow_ptype(as_nanoarrow_array(1:10))

nanoarrow documentation built on Sept. 30, 2023, 1:06 a.m.