is ensuring false instead of nil needed?

app/models/custom_field/order_statements.rb

@@ -34,8 +34,6 @@ def order_statement
     case field_format
     when "string", "date", "bool", "link", "int", "float", "list", "user", "version"
       "cf_order_#{id}.value"
-    else
-      false
     end
   end
 
@@ -69,6 +67,8 @@ def order_null_handling(asc)
   # which differ for multi-value select fields,
   # because in this case we do want the primary CV values
   def group_by_statement
+    return unless field_format.in?(%w[list date bool int])
+
     return order_statement unless field_format == "list"
 
     if multi_value?

app/models/queries/work_packages/selects/custom_field_select.rb

@@ -33,16 +33,12 @@ def initialize(custom_field)
     @cf = custom_field
 
     @name = custom_field.column_name.to_sym
-    @sortable = custom_field.order_statement || false
-    @sortable_join = custom_field.order_join_statement || false
-    @groupable = groupable_custom_field?(custom_field) ? custom_field.group_by_statement || false : false
+    @sortable = custom_field.order_statement
+    @sortable_join = custom_field.order_join_statement
+    @groupable = custom_field.group_by_statement
     @summable = summable_statement
   end
 
-  def groupable_custom_field?(custom_field)
-    %w(list date bool int).include?(custom_field.field_format)
-  end
-
   def caption
     @cf.name
   end