In the SAP HANA developer guide there is a list explaining SQL - EDM Type mapping
Missing is how to map from a SQL Type to Edm.Boolean, anyone know how?
In the SAP HANA developer guide (SPS 07) it also says that the OData implementation in SAP HANA XS supports only those SQL types listed in the mentioned list/table. Therefore Edm.Boolean is not supported.
A workaround could be to use Edm.Byte instead of Edm.Boolean which is mapped to the TinyInt HANA SQL Type. If you only want to have a true/false or 0/1 value I think the TinyInt SQL Type is the closest you can get to a Boolean.