Solution : https://service.sap.com/sap/support/notes/79094 (SAP Service marketplace login required)
Key words :
symptom incorrect optimization behavior, additional key words optimizer, regular 'update statistics' runs, sapdba -updstat -threshold 0 -logfile <, execute 'update statistics', optimal access path, update statistics, optimizer strategy, function 'updstat', current 'sapdba
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