read_json_arrow {arrow}R Documentation

Read a JSON file

Description

Using JsonTableReader

Usage

read_json_arrow(
  file,
  col_select = NULL,
  as_data_frame = TRUE,
  schema = NULL,
  ...
)

Arguments

file

A character file name or URI, raw vector, an Arrow input stream, or a FileSystem with path (SubTreeFileSystem). If a file name, a memory-mapped Arrow InputStream will be opened and closed when finished; compression will be detected from the file extension and handled automatically. If an input stream is provided, it will be left open.

col_select

A character vector of column names to keep, as in the "select" argument to data.table::fread(), or a tidy selection specification of columns, as used in dplyr::select().

as_data_frame

Should the function return a data.frame (default) or an Arrow Table?

schema

Schema that describes the table.

...

Additional options passed to JsonTableReader$create()

Value

A data.frame, or a Table if as_data_frame = FALSE.

Examples


tf <- tempfile()
on.exit(unlink(tf))
writeLines('
    { "hello": 3.5, "world": false, "yo": "thing" }
    { "hello": 3.25, "world": null }
    { "hello": 0.0, "world": true, "yo": null }
  ', tf, useBytes = TRUE)
df <- read_json_arrow(tf)


[Package arrow version 6.0.1 Index]