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Status Submitted
Workspace Informix
Components Informix Server
Created by Guest
Created on Feb 13, 2023

Implement nested loop join of external and indexed tables

We raised a support case for this, but creating here will help it progress. The description was as shown below. Please vote for it!

Doug Lawry
Oninit Consulting

Try this in the "stores_demo" database:

SELECT {+USE_NL(customer)} *
FROM ext_customer AS e
JOIN customer AS c ON c.zipcode = e.zipcode;

That does return 3 rows, but the query plan details are:

USE_NL ( customer ) Join Method and Ordered directives conflict or hash join cannot be enforced.

Estimated Cost: 11
Estimated # of Rows Returned: 3

1) informix.c: SEQUENTIAL SCAN
2) informix.e: SEQUENTIAL SCAN

Dynamic Hash Filters: informix.c.zipcode = informix.e.zipcode

Whatever optimizer directives are applied (or none), it always uses the above plan.

This defect meant a customer had to load a 34 million row file into a raw table rather than using directly as an external table, which is a major functional failure.

Needed By Quarter