hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/EdgeLabelBuilder.java [589:623]:
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                        this.ttlStartTime, this.name, this.properties);
        PropertyKey pkey = this.graph().propertyKey(this.ttlStartTime);
        E.checkArgument(pkey.dataType().isDate(),
                        "The ttl start time property must be date type," +
                        "but got '%s(%s)'", this.ttlStartTime, pkey.dataType());
    }

    private void checkUserdata(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (Map.Entry<String, Object> e : this.userdata.entrySet()) {
                    if (e.getValue() == null) {
                        throw new NotAllowException(
                                  "Not allowed pass null userdata value when " +
                                  "create or append edge label");
                    }
                }
                break;
            case ELIMINATE:
            case DELETE:
                // pass
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }

    private static Set<String> mapPkId2Name(HugeGraph graph, Set<Id> ids) {
        return new HashSet<>(graph.mapPkId2Name(ids));
    }

    private static List<String> mapPkId2Name(HugeGraph graph, List<Id> ids) {
        return graph.mapPkId2Name(ids);
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hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/VertexLabelBuilder.java [567:601]:
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                        this.ttlStartTime, this.name, this.properties);
        PropertyKey pkey = this.graph().propertyKey(this.ttlStartTime);
        E.checkArgument(pkey.dataType().isDate(),
                        "The ttl start time property must be date type," +
                        "but got '%s(%s)'", this.ttlStartTime, pkey.dataType());
    }

    private void checkUserdata(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (Map.Entry<String, Object> e : this.userdata.entrySet()) {
                    if (e.getValue() == null) {
                        throw new NotAllowException(
                                  "Not allowed pass null userdata value when " +
                                  "create or append edge label");
                    }
                }
                break;
            case ELIMINATE:
            case DELETE:
                // pass
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }

    private static Set<String> mapPkId2Name(HugeGraph graph, Set<Id> ids) {
        return new HashSet<>(graph.mapPkId2Name(ids));
    }

    private static List<String> mapPkId2Name(HugeGraph graph, List<Id> ids) {
        return graph.mapPkId2Name(ids);
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