JSON to Parquet
Convert JSON files to Apache Parquet. 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 json2parquet
To avoid re-compilation and speed up installation, you can install this tool with cargo binstall:
cargo binstall json2parquet
Usage
```
Usage: json2parquet [OPTIONS]
Arguments:
Input JSON file, stdin if not present
Output file
Options:
-s, --schema-file
File with Arrow schema in JSON format
--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
-c, --compression
Set the compression [possible values: uncompressed, snappy, gzip, lzo, brotli, lz4, zstd, lz4-raw]
-e, --encoding
Sets encoding for any column [possible values: plain, rle, bit-packed, delta-binary-packed, delta-length-byte-array, delta-byte-array, rle-dictionary]
--data-page-size-limit
Sets data page size limit
--dictionary-page-size-limit
Sets dictionary page size limit
--write-batch-size
Sets write batch size
--max-row-group-size
Sets max size for a row group
--created-by
Sets "created by" property
--dictionary
Sets flag to enable/disable dictionary encoding for any column
--statistics
Sets flag to enable/disable statistics for any column [possible values: none, chunk, page]
--max-statistics-size
Sets max statistics size for any column. Applicable only if statistics are enabled
-p, --print-schema
Print the schema to stderr
-n, --dry
Only print the schema
-h, --help
Print help
-V, --version
Print version
```
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.
json
{ "a": 42, "b": true }
{ "a": 12, "b": false }
{ "a": 7, "b": true }