A gateway/proxy for using any PostgreSQL client to connect to and run SQL queries in a Trino cluster.
It is an experiment to test Trino access in programs that do not support the official Trino drivers, like JDBC.
It does not implement 100% client functionality and it is using the Trino Go client, which itself is not complete yet.
It does NOT parse PostgreSQL queries and expects ANSII SQL queries supported by Trino. To fully support PostgreSQL queries, it would be better to implement it as a PostgreSQL Foreign Data Wrapper (FDW)
Start the server, pointing it to a Trino cluster:
./trino-postgresql-gateway -target http://user@localhost:8080Then connect to it using any PostgreSQL client, like psql:
psql -h localhost -U aaa -c 'select * from tpch.tiny.nation limit 2'To run the latest version directly from the main branch:
go run github.com/nineinchnick/trino-postgresql-gateway -listen localhost:5432 -target http://localhost:8080There's no authentication for PostgreSQL clients.
Trino authentication has to be specified in the -target option.
Only basic data types are supported, like VARCHAR, INTEGER and DOUBLE.
Simple queries are not being split, so if multiple queries are send together they'll fail to execute.
Prepared statements are supported, but PostgreSQL uses positional placeholders
like $1, which are replaced with ? using a plain regular expression.
This means it might break queries that contain strings like this in literal
values or quoted identifiers.
Trino queries execute with a fixed timeout of 1 minute and cannot be cancelled.
Trino query errors are not decoded into PostgreSQL errors, so only an error message is returned, without details like the number of query line and column where an error ocurred.
Most PostgreSQL tools that support schema discovery (like listing tables)
do so by querying the PostgreSQL's system catalogs.
They're not available in Trino. To read metadata, query
the information_schema schema.