https://userapps.support.sap.com/sap/support/knowledge/en/3467930
3467930 - High Memory usage for HANA heap allocator Pool/RowEngine/SQLPlan when HANA HEX Engine is...
HANA Database Hangs due to high memory usage for the HANA heap allocator Pool/RowEngine/SQLPlan when HANA HEX Engine is used