private static void buildFunctionImports(MetadataStore metadataStore, List<Builder> edmSchemas) {
    for (Schema schema : metadataStore.getSchemaList()) {

      EdmSchema.Builder odataSchema = findSchema(edmSchemas, schema.getName());
      EdmEntityContainer.Builder entityContainer =
          findEntityContainer(edmSchemas, schema.getName());

      // procedures
      for (Procedure proc : schema.getProcedures().values()) {
        EdmFunctionImport.Builder edmProcedure = EdmFunctionImport.newBuilder();
        edmProcedure.setName(proc.getName());
        String httpMethod = "POST";

        for (ProcedureParameter pp : proc.getParameters()) {
          if (pp.getName().equals("return")) {
            httpMethod = "GET";
            edmProcedure.setReturnType(
                ODataTypeManager.odataType(pp.getDatatype().getRuntimeTypeName()));
            continue;
          }

          EdmFunctionParameter.Builder param = EdmFunctionParameter.newBuilder();
          param.setName(pp.getName());
          param.setType(ODataTypeManager.odataType(pp.getDatatype().getRuntimeTypeName()));

          if (pp.getType() == ProcedureParameter.Type.In) {
            param.setMode(Mode.In);
          } else if (pp.getType() == ProcedureParameter.Type.InOut) {
            param.setMode(Mode.InOut);
          } else if (pp.getType() == ProcedureParameter.Type.Out) {
            param.setMode(Mode.Out);
          }

          param.setNullable(pp.getNullType() == NullType.Nullable);
          edmProcedure.addParameters(param);
        }

        // add a complex type for return resultset.
        ColumnSet<Procedure> returnColumns = proc.getResultSet();
        if (returnColumns != null) {
          httpMethod = "GET";
          EdmComplexType.Builder complexType = EdmComplexType.newBuilder();
          complexType.setName(proc.getName() + "_" + returnColumns.getName());
          complexType.setNamespace(schema.getName());
          for (Column c : returnColumns.getColumns()) {
            EdmProperty.Builder property =
                EdmProperty.newBuilder(c.getName())
                    .setType(ODataTypeManager.odataType(c.getDatatype().getRuntimeTypeName()))
                    .setNullable(c.getNullType() == NullType.Nullable);
            if (c.getDatatype()
                .getRuntimeTypeName()
                .equals(DataTypeManager.DefaultDataTypes.STRING)) {
              property
                  .setFixedLength(c.isFixedLength())
                  .setMaxLength(c.getLength())
                  .setUnicode(true);
            }
            complexType.addProperties(property);
          }
          odataSchema.addComplexTypes(complexType);
          edmProcedure.setIsCollection(true);
          edmProcedure.setReturnType(
              EdmCollectionType.newBuilder()
                  .setCollectionType(complexType)
                  .setKind(CollectionKind.Collection));
        }
        edmProcedure.setHttpMethod(httpMethod);
        entityContainer.addFunctionImports(edmProcedure);
      }
    }
  }