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MariaDB into Apache Arrow with ADBC

MariaDB 11, 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

MariaDB Connector/ODBC 3.1

Wire

MySQL wire

adbcBridge

0.1.1 (release)

The connection string the matrix used, as the connection strings reference records it (MariaDB Connector/ODBC); {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=13306;Database=adbc;User=adbc;Password=adbc;{no_ssps}

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=13306;Database=adbc;User=adbc;Password=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 MariaDB 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

the driver's parameter arrays go as one COM_STMT_BULK_EXECUTE and beat the multi-row INSERT, so it opts into prefer_param_arrays (3.1.15 on Linux; from Connector/ODBC 3.2 arrays are off — see the macOS cell)

Native ADBC driver, compared

MariaDB speaks the MySQL wire protocol, so the ADBC Driver Foundry's native MySQL ADBC driver (0.6.0) 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 MariaDB; the full table for all 28 wire-compatible databases, with each first error, is in the note.

Read next

• Which older engine releases pass the matrix entry unchanged
• MariaDB Connector/ODBC 3.2 segfaults on a NULL DATE in a parameter array