Extension is not sending the original query to MySQL

[ulissescappato]

What happens?

I'm trying to update a DuckDB database with only incremental data, but the extension searches the entire table in the source table (MySQL).

To Reproduce

Dbeaver:

ATTACH '...' AS mysql_test (TYPE mysql_scanner, READ_ONLY);
SELECT * FROM mysql_test.sales WHERE id > 10000000

MySQL:

SELECT *
FROM INFORMATION_SCHEMA.PROCESSLIST
WHERE command = 'Query'
order by time desc

Listed query:

SELECT id, product, total FROM schema_test.sales

Note that the query running in MySQL does not have the 'WHERE' clause.

OS:

Windows 11

MySQL Version:

8.0.32

DuckDB Version:

0.9.2

DuckDB Client:

DBeaver

Full Name:

Ulisses

Affiliation:

Developer

Have you tried this on the latest main branch?

• I agree

Have you tried the steps to reproduce? Do they include all relevant data and configuration? Does the issue you report still appear there?

• I agree

[Mytherin]

Thanks for the report! Filter pushdown is not enabled by default currently, try SET mysql_experimental_filter_pushdown=true and re-running.

[ulissescappato]

Thanks for the report! Filter pushdown is not enabled by default currently, try SET mysql_experimental_filter_pushdown=true and re-running.

Thanks, Mark!

[rlancer]

Thanks for your work on the extension!

Found #50

Should loading the entire table be the desired behavior? My use case is connecting many tables together from different data sources, these tables are way larger than I could fit in memory

My initial query which didn't work:

`select * from mysql.table limit = 10` still fails for me even with `SET mysql_experimental_filter_pushdown=true`

`where in (list of ids...)` does work

Note I am running these queries on PlantScale which fails after 100k results