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Postgres protocol frontend for DataFusion
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- 10/26/2026
gem-hunterPostgres protocol frontend for DataFusion
A PostgreSQL-compatible server frontend for Apache DataFusion. Available as both a library and CLI tool.
Built on pgwire to provide PostgreSQL wire protocol compatibility for analytical workloads. It was originally an example of the pgwire project.
datafusion-postgres: Postgres frontend for datafusion, as a library.
SessionContext with pgwire librarydatafusion-pg-catalog: A Postgres compatible pg_catalog schema and
functions for datafusion backend.arrow-pg: A data type mapping, encoding/decoding library for arrow and
postgres(pgwire) data types.datafusion-postgres-cli: A cli tool starts a postgres compatible server for
datafusion supported file formats, just like python's SimpleHTTPServer.The high-level entrypoint of datafusion-postgres library is the serve
function which takes a datafusion SessionContext and some server configuration
options.
use std::sync::Arc; use datafusion::prelude::SessionContext; use datafusion_postgres::{serve, ServerOptions}; use datafusion_pg_catalog::setup_pg_catalog; // Create datafusion SessionContext let session_context = Arc::new(SessionContext::new()); // Configure your `session_context` // ... // Optional: setup pg_catalog schema setup_pg_catalog(session_context, "datafusion")?; // Start the Postgres compatible server with SSL/TLS let server_options = ServerOptions::new() .with_host("127.0.0.1".to_string()) .with_port(5432) // Optional: setup tls .with_tls_cert_path(Some("server.crt".to_string())) .with_tls_key_path(Some("server.key".to_string())); serve(session_context, &server_options).await
Command-line tool to serve JSON/CSV/Arrow/Parquet/Avro files as
PostgreSQL-compatible tables. This is like a SimpleHTTPServer for hosting data
files, but with Postgres protocol and datafusion query engine.
datafusion-postgres-cli 0.6.1
A PostgreSQL interface for DataFusion. Serve CSV/JSON/Arrow/Parquet files as tables.
USAGE:
datafusion-postgres-cli [OPTIONS]
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
--arrow <arrow-tables>... Arrow files to register as table, using syntax `table_name:file_path`
--avro <avro-tables>... Avro files to register as table, using syntax `table_name:file_path`
--csv <csv-tables>... CSV files to register as table, using syntax `table_name:file_path`
-d, --dir <directory> Directory to serve, all supported files will be registered as tables
--host <host> Host address the server listens to [default: 127.0.0.1]
--json <json-tables>... JSON files to register as table, using syntax `table_name:file_path`
--parquet <parquet-tables>... Parquet files to register as table, using syntax `table_name:file_path`
-p <port> Port the server listens to [default: 5432]
--tls-cert <tls-cert> Path to TLS certificate file for SSL/TLS encryption
--tls-key <tls-key> Path to TLS private key file for SSL/TLS encryption
# Run with SSL/TLS encryption datafusion-postgres-cli \ --csv data:sample.csv \ --tls-cert server.crt \ --tls-key server.key # Run without encryption (development only) datafusion-postgres-cli --csv data:sample.csv
Host a CSV dataset as a PostgreSQL-compatible table:
datafusion-postgres-cli --csv climate:delhiclimate.csv
Loaded delhiclimate.csv as table climate
TLS not configured. Running without encryption.
Listening on 127.0.0.1:5432 (unencrypted)
psql -h 127.0.0.1 -p 5432 -U postgres
postgres=> SELECT COUNT(*) FROM climate; count ------- 1462 (1 row) postgres=> SELECT date, meantemp FROM climate WHERE meantemp > 35 LIMIT 5; date | meantemp ------------+---------- 2017-05-15 | 36.9 2017-05-16 | 37.9 2017-05-17 | 38.6 2017-05-18 | 37.4 2017-05-19 | 35.4 (5 rows) postgres=> BEGIN; BEGIN postgres=> SELECT AVG(meantemp) FROM climate; avg ------------------ 25.4955206557617 (1 row) postgres=> COMMIT; COMMIT
# Generate SSL certificates openssl req -x509 -newkey rsa:4096 -keyout server.key -out server.crt \ -days 365 -nodes -subj "/C=US/ST=CA/L=SF/O=MyOrg/CN=localhost" # Start secure server datafusion-postgres-cli \ --csv climate:delhiclimate.csv \ --tls-cert server.crt \ --tls-key server.key
Loaded delhiclimate.csv as table climate
TLS enabled using cert: server.crt and key: server.key
Listening on 127.0.0.1:5432 with TLS encryption
With geodatafusion, we
can also simulate PostGIS interface (UDF and datatypes) with
datafusion-postgres. To enable this feature, turn on the feature flag postgis
for datafusion-postgres.
If you like the idea of pgwire, datafusion-postgres and want to join the development of the library, or its ecosystem integrations, extensions, you are welcomed to join our developer mailing list: https://groups.io/g/pgwire-dev/
This library is released under Apache license.