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Optimization issue if a business_time_oriented table has only one row. In syscat.columns the content of the business_time columns are detected (high2key, low2key) but the value can not be found in the distribution statistics. This leads default filter factors (1/3) of the to business time predicates and in sum to a way too small filter factor. This leads to a MSJOIN with a low filtering join-predicate (which we don't like eather. The statistics would be needed to be brought into syscoldist? Omiting sampling was not successful.
This single row table was not the the main source of the cardinality under-estimation error in the original query they provided.
The issue here is that the optimizer does not use HIGH2KEY/LOW2KEY for columns with COLCARD 1.
This is a known issue and certainly something that needs to be be improved,
Needed By | Quarter |
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