DataFusion Command-line SQL Utility¶
The DataFusion CLI is a command-line interactive SQL utility that allows queries to be executed against any supported data files. It is a convenient way to try DataFusion out with your own data sources.
Example¶
Create a CSV file to query.
$ echo "1,2" > data.csv
$ datafusion-cli
DataFusion CLI v12.0.0
❯ CREATE EXTERNAL TABLE foo STORED AS CSV LOCATION 'data.csv';
0 rows in set. Query took 0.017 seconds.
❯ select * from foo;
+----------+----------+
| column_1 | column_2 |
+----------+----------+
| 1 | 2 |
+----------+----------+
1 row in set. Query took 0.012 seconds.
Installation¶
Install and run using Cargo¶
The easiest way to install DataFusion CLI a spin is via cargo install datafusion-cli.
Install and run using Homebrew (on MacOS)¶
DataFusion CLI can also be installed via Homebrew (on MacOS). Install it as any other pre-built software like this:
brew install datafusion
# ==> Downloading https://ghcr.io/v2/homebrew/core/datafusion/manifests/12.0.0
# ######################################################################## 100.0%
# ==> Downloading https://ghcr.io/v2/homebrew/core/datafusion/blobs/sha256:9ecc8a01be47ceb9a53b39976696afa87c0a8
# ==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/sha256:9ecc8a01be47ceb9a53b39976
# ######################################################################## 100.0%
# ==> Pouring datafusion--12.0.0.big_sur.bottle.tar.gz
# 🍺 /usr/local/Cellar/datafusion/12.0.0: 9 files, 17.4MB
datafusion-cli
Run using Docker¶
There is no officially published Docker image for the DataFusion CLI, so it is necessary to build from source instead.
Use the following commands to clone this repository and build a Docker image containing the CLI tool. Note
that there is .dockerignore file in the root of the repository that may need to be deleted in order for
this to work.
git clone https://github.com/apache/arrow-datafusion
git checkout 12.0.0
cd arrow-datafusion
docker build -f datafusion-cli/Dockerfile . --tag datafusion-cli
docker run -it -v $(your_data_location):/data datafusion-cli
Usage¶
Apache Arrow <dev@arrow.apache.org>
Command Line Client for DataFusion query engine.
USAGE:
datafusion-cli [OPTIONS]
OPTIONS:
-c, --batch-size <BATCH_SIZE> The batch size of each query, or use DataFusion default
-f, --file <FILE>... Execute commands from file(s), then exit
--format <FORMAT> [default: table] [possible values: csv, tsv, table, json,
nd-json]
-h, --help Print help information
-p, --data-path <DATA_PATH> Path to your data, default to current directory
-q, --quiet Reduce printing other than the results and work quietly
-r, --rc <RC>... Run the provided files on startup instead of ~/.datafusionrc
-V, --version Print version information
Type `exit` or `quit` to exit the CLI.
Registering Parquet Data Sources¶
Parquet data sources can be registered by executing a CREATE EXTERNAL TABLE SQL statement. It is not necessary to provide schema information for Parquet files.
CREATE EXTERNAL TABLE taxi
STORED AS PARQUET
LOCATION '/mnt/nyctaxi/tripdata.parquet';
Registering CSV Data Sources¶
CSV data sources can be registered by executing a CREATE EXTERNAL TABLE SQL statement.
CREATE EXTERNAL TABLE test
STORED AS CSV
WITH HEADER ROW
LOCATION '/path/to/aggregate_test_100.csv';
It is also possible to provide schema information.
CREATE EXTERNAL TABLE test (
c1 VARCHAR NOT NULL,
c2 INT NOT NULL,
c3 SMALLINT NOT NULL,
c4 SMALLINT NOT NULL,
c5 INT NOT NULL,
c6 BIGINT NOT NULL,
c7 SMALLINT NOT NULL,
c8 INT NOT NULL,
c9 BIGINT NOT NULL,
c10 VARCHAR NOT NULL,
c11 FLOAT NOT NULL,
c12 DOUBLE NOT NULL,
c13 VARCHAR NOT NULL
)
STORED AS CSV
LOCATION '/path/to/aggregate_test_100.csv';
Commands¶
Available commands inside DataFusion CLI are:
Quit
> \q
Help
> \?
ListTables
> \d
DescribeTable
> \d table_name
QuietMode
> \quiet [true|false]
list function
> \h
Search and describe function
> \h function_table