IBM Data and AI

Welcome to the IBM Data and AI Ideas Portal for Clients!

We welcome and appreciate your feedback on IBM Data and AI Products to help make them even better than they are today!
Before you submit an idea, please perform a search first as a similar idea may have already been reported in the portal. If a related idea is not yet listed, please create a new idea and include with it a description which includes expected behavior as well as why having this feature would improve the service and how it would address your use case.
IBM Employees:
Clients:
  • Our team welcomes any feedback and suggestions you have for improving our offerings / products! This forum allows us to connect your offering / product improvement ideas with IBM product and engineering teams.

  • If you have not registered on this portal please click on the following link and register. To complete registration you will need to open the email you will receive from Aha to confirm your identity. http://ibm.biz/IBM-Data-and-AI-Portal-Register

Additional Information:
  • The shorter URL for this site is: https://ibm.biz/IBM-Data-and-AI-Ideas

  • To view our roadmaps: http://ibm.biz/Data-and-AI-Roadmaps

  • Reminder: This is not the place to submit defects or support needs, please use normal support channel for these cases

  • Please do not use the Ideas Portal for reporting bugs - we ask that you report bugs or issues with the product by contacting IBM support.

Echo predicate functinality for sub queries

Issue Statement:

Echo predicate is not working properly to eliminate partition and query is taking longer time to complete

Filter With Hard Coded date: Query completes in 2 secs , since it is directly hitting the July 31st partition alone

SELECT * FROM ESA_QV_IL_DATAT1.MDM_IP WHERE SNAPSHOT_DT = '2017-07-31';

Filter With Sub Query: Query took 8 mins to complete and we are facing performance issue.

SELECT * FROM ESA_QV_IL_DATAT1.MDM_IP WHERE SNAPSHOT_DT = (SELECT MAX(SNAPSHOT_DT) FROM ESA_QV_IL_DATAT1.MDM_IP );

Note: SELECT MAX(SNAPSHOT_DT) FROM ESA_QV_IL_DATAT1.MDM_IP à Query returned results in 42 seconds

Usually it will process sub query first and pass the latest date results to the outer sql, So that outer sql will process only for the filtered latest date. But here, it is doing nested loop join between these 2 tables for entire history and at last it is eliminating the latest date partition. so query is running for long time.

We like to include this feature in the product, so that it will improve performance in our process.
  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Dec 28 2018
  • Under Review
Idea Priority Medium
Customer Name KeyBank
  • Attach files

NOTICE TO EU RESIDENTS: per EU Data Protection Policy, if you wish to remove your personal information from the IBM ideas portal, please login to the ideas portal using your previously registered information then change your email to "anonymous@euprivacy.out" and first name to "anonymous" and last name to "anonymous". This will ensure that IBM will not send any emails to you about all idea submissions