arrow (version 4.0.0)

data-type: Apache Arrow data types

Description

These functions create type objects corresponding to Arrow types. Use them when defining a schema() or as inputs to other types, like struct. Most of these functions don't take arguments, but a few do.

Usage

int8()
int16()
int32()
int64()
uint8()
uint16()
uint32()
uint64()
float16()
halffloat()
float32()
float()
float64()
boolean()
bool()
utf8()
large_utf8()
binary()
large_binary()
fixed_size_binary(byte_width)
string()
date32()
date64()
time32(unit = c("ms", "s"))
time64(unit = c("ns", "us"))
null()
timestamp(unit = c("s", "ms", "us", "ns"), timezone = "")
decimal(precision, scale)
struct(...)
list_of(type)
large_list_of(type)
fixed_size_list_of(type, list_size)

Arguments

byte_width

byte width for FixedSizeBinary type.

unit

For time/timestamp types, the time unit. time32() can take either "s" or "ms", while time64() can be "us" or "ns". timestamp() can take any of those four values.

timezone

For timestamp(), an optional time zone string.

precision

For decimal(), precision

scale

For decimal(), scale

...

For struct(), a named list of types to define the struct columns

type

For list_of(), a data type to make a list-of-type

list_size

list size for FixedSizeList type.

Value

An Arrow type object inheriting from DataType.

Details

A few functions have aliases:

• utf8() and string()

• float16() and halffloat()

• float32() and float()

• bool() and boolean()

• When called inside an arrow function, such as schema() or cast(), double() also is supported as a way of creating a float64()

date32() creates a datetime type with a "day" unit, like the R Date class. date64() has a "ms" unit.

uint32 (32 bit unsigned integer), uint64 (64 bit unsigned integer), and int64 (64-bit signed integer) types may contain values that exceed the range of R's integer type (32-bit signed integer). When these arrow objects are translated to R objects, uint32 and uint64 are converted to double ("numeric") and int64 is converted to bit64::integer64. For int64 types, this conversion can be disabled (so that int64 always yields a bit64::integer64 object) by setting options(arrow.int64_downcast = FALSE).

See Also

dictionary() for creating a dictionary (factor-like) type.

Examples

# NOT RUN {
bool()
struct(a = int32(), b = double())
timestamp("ms", timezone = "CEST")
time64("ns")
# }