Solution : https://service.sap.com/sap/support/notes/1485841 (SAP Service marketplace login required)
Key words : 
alter index rebuildor   alter index rebuild partitionyou executed   exec dbms_stats, index rebuild / index parititon rebuild, restore_table_statsfor alter index rebuild, terms alter index rebuild, alter index rebuild partition, alter index rebuild, oracle optimizer merge fix, last_analyzedfrom dba_indexeswhere index_name = '<index_name, last_analyzedfrom dba_ind_partitionswhere index_name = '<index_name>', sap bundle patch sap_102045_201009
Related Notes : 
       
| 1360603 | Reorganizing and rebuilding individual partitions | 
| 1020260 | Delivery of Oracle statistics (Oracle 10g, 11g) | 
| 448380 | Information: Oracle Package DBMS_STATS | 
| 332677 | Rebuilding fragmented indexes |