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Create R type to Arrow DataType mapping

Source: R/utils-arrow-types.R
r_to_arrow_datatypes.Rd

Returns a named list mapping base R type strings (e.g., "character", "integer") to their corresponding Arrow arrow::DataType objects. This is the inverse of arrow_to_r_datatypes and is useful when creating Arrow schemas programmatically from R type specifications.

Usage

r_to_arrow_datatypes()

Value

A named list with 6 entries mapping R types to Arrow DataType objects:

logical

arrow::bool()

integer

arrow::int32() (uses int32 as default)

double

arrow::float64()

character

arrow::utf8()

Date

arrow::date32()

POSIXct

arrow::timestamp(unit = "ms")

Details

This function generates the mapping dynamically. The R type strings match those used in the non_task_id_schema field of target-data.json configuration files.

This is particularly useful for:

  • Creating custom Arrow schemas from R type specifications

  • Converting configuration-based type information to Arrow schemas

  • Programmatic schema generation

See also

arrow_to_r_datatypes, create_timeseries_schema(), create_oracle_output_schema()

Examples

# Get the mapping
type_map <- r_to_arrow_datatypes()

# Use it to create Arrow types from R type strings
r_types <- c("character", "integer", "double")
arrow_types <- type_map[r_types]

# Create a simple Arrow schema
my_schema <- arrow::schema(
  name = type_map[["character"]],
  age = type_map[["integer"]],
  score = type_map[["double"]]
)
my_schema
#> Schema
#> name: string
#> age: int32
#> score: double