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Citus into Apache Arrow with ADBC

Citus 14.1 (PostgreSQL 18), read and written through adbcBridge — the ADBC driver that loads the database's ODBC driver — verified on Linux, macOS arm64 and Windows x64. Everything below is the compatibility matrix's record for this row.

Status

Driver and connection string

ODBC driver

psqlodbc 16 (PG wire)

Wire

PostgreSQL wire

adbcBridge

0.1.1 (release)

The connection string the matrix used, as the connection strings reference records it (PostgreSQL wire); {drv} is the driver library or its name from odbcinst.ini, and the host, port and credentials are the test server's.

Driver={drv};Server=127.0.0.1;Port=15436;Database=adbc;Uid=adbc;Pwd=adbc;

Python

import adbcbridge

# {drv}: the ODBC driver library (path), or its name from odbcinst.ini
conn = adbcbridge.connect(uri="Driver={drv};Server=127.0.0.1;Port=15436;Database=adbc;Uid=adbc;Pwd=adbc;")
with conn.cursor() as cur:
    cur.execute("SELECT * FROM my_table")
    table = cur.fetch_arrow_table()      # pyarrow.Table

Polars and pandas

import polars as pl, pandas as pd

df = pl.read_database("SELECT * FROM my_table", connection=conn)   # Polars, Arrow-native
pdf = pd.read_sql("SELECT * FROM my_table", conn)                   # pandas 2.2+, ADBC connection

pip install adbcbridge brings the driver library; the Citus ODBC driver is installed the way its vendor documents, then named in Driver=. Rust, Go, C# and Java use the same connection string through their ADBC driver managers — see the docs.

What the matrix recorded

no quirks; an extension on stock PostgreSQL, so the array-ingest form applies and is used, distributed tables included (verified: the entry also ingests into and reads back a create_distributed_table() hash-distributed table); a fresh single node needs no registration -- create_distributed_table() registers the coordinator itself with shouldhaveshards on; if the coordinator was registered with citus_set_coordinator_host() alone, shouldhaveshards has to be set too or create_distributed_table() fails with replication_factor (1) exceeds number of worker nodes (0); ingest 107k rows/s (array binding), fetch 1.86M rows/s

Native ADBC driver, compared

Citus speaks the PostgreSQL wire protocol, so Apache Arrow's native PostgreSQL ADBC driver (adbc-driver-postgresql 1.12.0) can be pointed at it too. On 2026-09-05 the same seven-step ADBC workload (connect, SELECT 1, DDL and inserts and a read, a 1,000-row adbc_ingest, table schema, catalog listing, read back) ran through both:

Where the native driver stops it is by design of that driver, not a defect of Citus; the full table for all 28 wire-compatible databases, with each first error, is in the note.

Read next

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