WIP: SELECT for GRPC API

caosdb-proto @ fd60795f

-Subproject commit 0b301401cf28d7a3edeb2c55e418f072b83cf5a7
+Subproject commit fd60795f62335368255797db43eb0429ec1705fc

src/main/java/org/caosdb/server/grpc/CaosDBToGrpcConverters.java

@@ -45,6 +45,8 @@ import org.caosdb.api.entity.v1.MessageCode;
 import org.caosdb.api.entity.v1.Parent;
 import org.caosdb.api.entity.v1.ReferenceDataType;
 import org.caosdb.api.entity.v1.ScalarValue;
+import org.caosdb.api.entity.v1.SelectQueryColumn;
+import org.caosdb.api.entity.v1.SelectQueryHeader;
 import org.caosdb.api.entity.v1.SelectQueryResult;
 import org.caosdb.api.entity.v1.SpecialValue;
 import org.caosdb.api.entity.v1.Version;
@@ -595,6 +597,14 @@ public class CaosDBToGrpcConverters {
       RetrieveContainer container) {
     // TODO(tf)
     SelectQueryResult.Builder result = SelectQueryResult.newBuilder();
+    result.setHeader(convertSelectQueryHeader(container));
+    return result;
+  }
+
+  private SelectQueryHeader.Builder convertSelectQueryHeader(RetrieveContainer container) {
+    SelectQueryHeader.Builder result = SelectQueryHeader.newBuilder();
+    // TODO(tf)
+    result.addColumns(SelectQueryColumn.newBuilder().setName("col1"));
     return result;
   }
 }