Boring Data Tool (bdt) 🤓

Command-line tool for viewing, querying, converting, and comparing files in popular data formats (CSV, Parquet, JSON, and Avro).

Powered by Apache Arrow and DataFusion.

Features

• View file schemas
• View contents of files
• Run SQL queries against files
• Convert between file formats
• Compare contents of two files, allowing an epsilon to be provided for floating point comparisons
• View Parquet file metadata (statistics)
• Supports CSV, JSON, Parquet, and Avro file formats

Prerequisites

• Install Rust

Installation

cargo install bdt

Usage

Boring Data Tool

USAGE:
    bdt <SUBCOMMAND>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

SUBCOMMANDS:
    compare              Compare the contents of two files
    convert              Convert a file to a different format
    count                Show the row count of the file
    help                 Prints this message or the help of the given subcommand(s)
    query                Run a SQL query against one or more files
    schema               View schema of a file
    view                 View contents of a file
    view-parquet-meta    View Parquet metadata

Examples

View File Schema

bdt schema /mnt/bigdata/nyctaxi/yellow_tripdata_2022-01.parquet
+-----------------------+-----------------------------+-------------+
| column_name           | data_type                   | is_nullable |
+-----------------------+-----------------------------+-------------+
| VendorID              | Int64                       | YES         |
| tpep_pickup_datetime  | Timestamp(Nanosecond, None) | YES         |
| tpep_dropoff_datetime | Timestamp(Nanosecond, None) | YES         |
| passenger_count       | Float64                     | YES         |
| trip_distance         | Float64                     | YES         |
| RatecodeID            | Float64                     | YES         |
| store_and_fwd_flag    | Utf8                        | YES         |
| PULocationID          | Int64                       | YES         |
| DOLocationID          | Int64                       | YES         |
| payment_type          | Int64                       | YES         |
| fare_amount           | Float64                     | YES         |
| extra                 | Float64                     | YES         |
| mta_tax               | Float64                     | YES         |
| tip_amount            | Float64                     | YES         |
| tolls_amount          | Float64                     | YES         |
| improvement_surcharge | Float64                     | YES         |
| total_amount          | Float64                     | YES         |
| congestion_surcharge  | Float64                     | YES         |
| airport_fee           | Float64                     | YES         |
+-----------------------+-----------------------------+-------------+

View File Contents

$ bdt view /path/to/file.parquet --limit 10
+-----------+------------------+--------+--------+----------+----------+---------+---------+-------------+-------------+
| t_time_sk | t_time_id        | t_time | t_hour | t_minute | t_second | t_am_pm | t_shift | t_sub_shift | t_meal_time |
+-----------+------------------+--------+--------+----------+----------+---------+---------+-------------+-------------+
| 0         | AAAAAAAABAAAAAAA | 0      | 0      | 0        | 0        | AM      | third   | night       |             |
| 1         | AAAAAAAACAAAAAAA | 1      | 0      | 0        | 1        | AM      | third   | night       |             |
| 2         | AAAAAAAADAAAAAAA | 2      | 0      | 0        | 2        | AM      | third   | night       |             |
| 3         | AAAAAAAAEAAAAAAA | 3      | 0      | 0        | 3        | AM      | third   | night       |             |
| 4         | AAAAAAAAFAAAAAAA | 4      | 0      | 0        | 4        | AM      | third   | night       |             |
| 5         | AAAAAAAAGAAAAAAA | 5      | 0      | 0        | 5        | AM      | third   | night       |             |
| 6         | AAAAAAAAHAAAAAAA | 6      | 0      | 0        | 6        | AM      | third   | night       |             |
| 7         | AAAAAAAAIAAAAAAA | 7      | 0      | 0        | 7        | AM      | third   | night       |             |
| 8         | AAAAAAAAJAAAAAAA | 8      | 0      | 0        | 8        | AM      | third   | night       |             |
| 9         | AAAAAAAAKAAAAAAA | 9      | 0      | 0        | 9        | AM      | third   | night       |             |
+-----------+------------------+--------+--------+----------+----------+---------+---------+-------------+-------------+

Run SQL Query

Queries can be run against one or more tables. Table names are inferred from file names.

$ bdt query --table /mnt/bigdata/nyctaxi/yellow_tripdata_2022-01.parquet \
  --sql "SELECT COUNT(*) FROM yellow_tripdata_2022_01"
Registering table 'yellow_tripdata_2022_01' for /mnt/bigdata/nyctaxi/yellow_tripdata_2022-01.parquet
+-----------------+
| COUNT(UInt8(1)) |
+-----------------+
| 2463931         |
+-----------------+

Query results can also be written to disk by specifying an --output path.

$ bdt query --table /mnt/bigdata/nyctaxi/yellow_tripdata_2022-01.parquet \
  --sql "SELECT COUNT(*) FROM yellow_tripdata_2022_01" \
  --output results.csv
Registering table 'yellow_tripdata_2022_01' for /mnt/bigdata/nyctaxi/yellow_tripdata_2022-01.parquet
Writing results in CSV format to results.csv

Convert Parquet to newline-delimited JSON

$ bdt convert /path/to/input.parquet /path/to/output.json
$ cat /path/to/output.json
{"d_date_sk":2415022,"d_date_id":"AAAAAAAAOKJNECAA","d_date":"1900-01-02","d_month_seq":0,"d_week_seq":1,"d_quarter_seq":1,"d_year":1900,"d_dow":1,"d_moy":1,"d_dom":2,"d_qoy":1,"d_fy_year":1900,"d_fy_quarter_seq":1,"d_fy_week_seq":1,"d_day_name":"Monday","d_quarter_name":"1900Q1","d_holiday":"N","d_weekend":"N","d_following_holiday":"Y","d_first_dom":2415021,"d_last_dom":2415020,"d_same_day_ly":2414657,"d_same_day_lq":2414930,"d_current_day":"N","d_current_week":"N","d_current_month":"N","d_current_quarter":"N","d_current_year":"N"}
{"d_date_sk":2415023,"d_date_id":"AAAAAAAAPKJNECAA","d_date":"1900-01-03","d_month_seq":0,"d_week_seq":1,"d_quarter_seq":1,"d_year":1900,"d_dow":2,"d_moy":1,"d_dom":3,"d_qoy":1,"d_fy_year":1900,"d_fy_quarter_seq":1,"d_fy_week_seq":1,"d_day_name":"Tuesday","d_quarter_name":"1900Q1","d_holiday":"N","d_weekend":"N","d_following_holiday":"N","d_first_dom":2415021,"d_last_dom":2415020,"d_same_day_ly":2414658,"d_same_day_lq":2414931,"d_current_day":"N","d_current_week":"N","d_current_month":"N","d_current_quarter":"N","d_current_year":"N"}

View Parquet File Metadata

$ bdt --view-parquet-meta /mnt/bigdata/tpcds/sf100-parquet/store_sales.parquet/part-00000-cff04137-32a6-4e5b-811a-668f5d4b1802-c000.snappy.parquet

+------------+----------------------------------------------------------------------------+
| Key        | Value                                                                      |
+------------+----------------------------------------------------------------------------+
| Version    | 1                                                                          |
| Created By | parquet-mr version 1.10.1 (build a89df8f9932b6ef6633d06069e50c9b7970bebd1) |
| Rows       | 40016                                                                      |
| Row Groups | 1                                                                          |
+------------+----------------------------------------------------------------------------+

Row Group 0 of 1 contains 40016 rows and has 190952 bytes:

+-----------------------+--------------+---------------+-----------------+-------+-----------------------------------------------------+------------------------------------+
| Column Name           | Logical Type | Physical Type | Distinct Values | Nulls | Min                                                 | Max                                |
+-----------------------+--------------+---------------+-----------------+-------+-----------------------------------------------------+------------------------------------+
| cd_demo_sk            | N/A          | INT32         | N/A             | 0     | 1520641                                             | 1560656                            |
| cd_gender             | N/A          | BYTE_ARRAY    | N/A             | 0     | [70]                                                | [77]                               |
| cd_marital_status     | N/A          | BYTE_ARRAY    | N/A             | 0     | [68]                                                | [87]                               |
| cd_education_status   | N/A          | BYTE_ARRAY    | N/A             | 0     | [50, 32, 121, 114, 32, 68, 101, 103, 114, 101, 101] | [85, 110, 107, 110, 111, 119, 110] |
| cd_purchase_estimate  | N/A          | INT32         | N/A             | 0     | 500                                                 | 10000                              |
| cd_credit_rating      | N/A          | BYTE_ARRAY    | N/A             | 0     | [71, 111, 111, 100]                                 | [85, 110, 107, 110, 111, 119, 110] |
| cd_dep_count          | N/A          | INT32         | N/A             | 0     | 0                                                   | 6                                  |
| cd_dep_employed_count | N/A          | INT32         | N/A             | 0     | 3                                                   | 4                                  |
| cd_dep_college_count  | N/A          | INT32         | N/A             | 0     | 5                                                   | 5                                  |
+-----------------------+--------------+---------------+-----------------+-------+-----------------------------------------------------+------------------------------------+