Solution : https://service.sap.com/sap/support/notes/832544 (SAP Service marketplace login required)
Key words : 
<join hint list> ]<access hint list>, experienced maxdb support staff, parameter setting optimize_queryrewrite = operator, disable_invonlythis hint excludes index-, parameter setting optimize_queryrewrite = statement, access=[<access hint list>], access=<access hint list>, abap open sql statements, problem analysis -> sql performance, parameter setting optimize_queryrewrite =
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| 767598 | Available SAP MaxDB documentation | 
| 723020 | Database hint SHORT_SUM_VALUES | 
| 652096 | Database hints in Open SQL for SAPDB/MaxDB | 
| 129385 | Database hints in Open SQL |