15 releases (7 breaking)

0.8.1 Mar 1, 2023
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0.4.0 May 19, 2022
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#265 in Database interfaces

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MIT/Apache

11KB
81 lines

JSON to Arrow

Crates.io

Convert JSON files to Apache Arrow. This package is part of Arrow CLI tools.

Installation

Download prebuilt binaries

You can get the latest releases from https://github.com/domoritz/arrow-tools/releases.

With Cargo

cargo install json2arrow

With Cargo B(inary)Install

To avoid re-compilation and speed up installation, you can install this tool with cargo binstall:

cargo binstall json2arrow

Usage

Usage: json2arrow [OPTIONS] <JSON> [ARROW]

Arguments:
  <JSON>   Input JSON file
  [ARROW]  Output file, stdout if not present

Options:
  -s, --schema-file <SCHEMA_FILE>
          File with Arrow schema in JSON format
  -m, --max-read-records <MAX_READ_RECORDS>
          The number of records to infer the schema from. All rows if not present. Setting max-read-records to zero will stop schema inference and all columns will be string typed
  -p, --print-schema
          Print the schema to stderr
  -n, --dry
          Only print the schema
  -h, --help
          Print help information
  -V, --version
          Print version information

The --schema-file option uses the same file format as --dry and --print-schema.

Limitations

Since we use the Arrow JSON loader, we are limited to what it supports. Right now, it supports JSON line-delimited files.

{ "a": 42, "b": true }
{ "a": 12, "b": false }
{ "a": 7, "b": true }

Dependencies

~10–37MB
~652K SLoC