Convert an object to a nanoarrow schema — as_nanoarrow

In nanoarrow a 'schema' refers to a struct ArrowSchema as defined in the Arrow C Data interface. This data structure can be used to represent an arrow::schema(), an arrow::field(), or an arrow::DataType. Note that in nanoarrow, an arrow::schema() and a non-nullable arrow::struct() are represented identically.

Usage

as_nanoarrow_schema(x, ...)

infer_nanoarrow_schema(x, ...)

nanoarrow_schema_parse(x, recursive = FALSE)

nanoarrow_schema_modify(x, new_values, validate = TRUE)

Arguments

x: An object to convert to a schema
...: Passed to S3 methods
recursive: Use TRUE to include a children member when parsing schemas.
new_values: New schema component to assign
validate: Use FALSE to skip schema validation

Value

An object of class 'nanoarrow_schema'

Examples

infer_nanoarrow_schema(integer())
#> <nanoarrow_schema int32>
#>  $ format    : chr "i"
#>  $ name      : chr ""
#>  $ metadata  : list()
#>  $ flags     : int 2
#>  $ children  : list()
#>  $ dictionary: NULL
infer_nanoarrow_schema(data.frame(x = integer()))
#> <nanoarrow_schema struct>
#>  $ format    : chr "+s"
#>  $ name      : chr ""
#>  $ metadata  : list()
#>  $ flags     : int 0
#>  $ children  :List of 1
#>   ..$ x:<nanoarrow_schema int32>
#>   .. ..$ format    : chr "i"
#>   .. ..$ name      : chr "x"
#>   .. ..$ metadata  : list()
#>   .. ..$ flags     : int 2
#>   .. ..$ children  : list()
#>   .. ..$ dictionary: NULL
#>  $ dictionary: NULL