This is just a short warning when you are upgrading to Teradata 16.20.
We recently upgraded from Teradata 15.10 to 16.20 and detected that some of our reporting queries returned with each execution a different result set. Sometimes the result set was correct, sometimes wrong.
After analyzing a little bit I found out that it's related to Incremental Planning and Execution (IPE). Seems that something can go wrong with the execution plan when this feature is active. I will further investigate and give you an update if I can find out more about this issue. It's quite possible that there is already a patch available. Any input is appreciated.
Since I turned this feature off, the result set is always correct (I am adding below query band as a pre-SQL to each Microstrategy report until this issue is fixed):
SET QUERY_BAND = ‘DynamicPlan=OFF;’ FOR SESSION;
I think this information might be useful for some of you experiencing this problem.