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4 VOTE

Status Not under consideration

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!

Regards,
Doug Lawry
Oninit Consulting

Try this in the "stores_demo" database:

SET EXPLAIN ON;
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:

DIRECTIVES FOLLOWED:
DIRECTIVES NOT FOLLOWED:
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 JOIN
    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

Post comment

1 MERGED

Implement nested loop join of external and indexed tables

Merged

Duplicate, cannot remove. Please vote for INFX-I-505.

about 1 year ago in Informix / Informix Server 2 Not under consideration

1 MERGED

Implement nested loop join of external and indexed tables

Merged

Duplicate, cannot remove. Please vote for INFX-I-505.

about 1 year ago in Informix / Informix Server 2 Not under consideration

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