README.md

bigquery_fdw: BigQuery Foreign Data Wrapper for PostgreSQL

bigquery_fdw is a BigQuery foreign data wrapper for PostgreSQL using Multicorn.

It allows to write queries in PostgreSQL SQL syntax using a foreign table. It supports most of BigQuery's data types and operators.

Features and limitations

• Table partitioning is supported. You can use partitions in your SQL queries.
• Queries are parameterized when sent to BigQuery
• BigQuery's standard SQL support (legacy SQL is not supported)
• Authentication works with a "Service Account" Json private key

Read more.

Requirements

• PostgreSQL >= 9.5 up to 14
• Python >= 3.4

Get started

Using docker

See getting started with Docker

Installation on Debian/Ubuntu

Dependencies required to install bigquery_fdw:

You need to install the following dependencies:

# Install required packages
apt update
apt install -y postgresql-server-dev-14 python3-setuptools python3-dev make gcc git

All PostgreSQL versions from 9.2 to 14 should be supported.

Installation

# Install Multicorn
# pgsql-io/multicorn2 is a fork of Segfault-Inc/Multicorn that adds support for PostgreSQL 13/14.
# Alternatively, up to PostgreSQL 12, you can use gabfl/Multicorn that adds better support for Python3.
# You may also choose to build against the original project instead.
git clone https://github.com/pgsql-io/multicorn2.git Multicorn && cd Multicorn
make && make install

# Install bigquery_fdw
pip3 install bigquery-fdw

Major dependencies installed automatically during the installation process:

• Google Cloud BigQuery
• Multicorn

Authentication

bigquery_fdw relies on Google Cloud API's default authentication.

Your need to have an environment variable GOOGLE_APPLICATION_CREDENTIALS that has to be accessible by bigquery_fdw. Setting environment variables varies depending on OS but for Ubuntu or Debian, the preferred way is to edit /etc/postgresql/[version]/main/environment and add:

GOOGLE_APPLICATION_CREDENTIALS = '/path/to/key.json'

Restarting PostgreSQL is required for the environment variable to be loaded.

Usage

We recommend testing the BigQuery client connectivity before trying to use the FDW.

With psql:

CREATE EXTENSION multicorn;

CREATE SERVER bigquery_srv FOREIGN DATA WRAPPER multicorn
OPTIONS (
    wrapper 'bigquery_fdw.fdw.ConstantForeignDataWrapper'
);

CREATE FOREIGN TABLE my_bigquery_table (
    column1 text,
    column2 bigint
) SERVER bigquery_srv
OPTIONS (
    fdw_dataset  'my_dataset',
    fdw_table 'my_table'
);

Options

List of options implemented in CREATE FOREIGN TABLE syntax:

Option	Default	Description
fdw_dataset	-	BigQuery dataset name
fdw_table	-	BigQuery table name
fdw_convert_tz	-	Convert BigQuery time zone for dates and timestamps to selected time zone. Example: 'US/Eastern'.
fdw_group	'false'	See Remote grouping and counting.
fdw_casting	-	See Casting.
fdw_verbose	'false'	Set to 'true' to output debug information in PostrgeSQL's logs
fdw_sql_dialect	'standard'	BigQuery SQL dialect. Currently only standard is supported.

More documentation

See bigquery_fdw documentation.