hugegraph-spark-connector/src/main/java/org/apache/hugegraph/spark/connector/builder/ElementBuilder.java [157:164]:
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    private boolean vertexIdEmpty(VertexLabel vertexLabel, Vertex vertex) {
        IdStrategy idStrategy = vertexLabel.idStrategy();
        if (idStrategy.isCustomizeString()) {
            Object vertexId = vertex.id();
            return vertexId == null || StringUtils.isEmpty((String) vertexId);
        }
        return false;
    }
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hugegraph-loader/src/main/java/org/apache/hugegraph/loader/builder/ElementBuilder.java [231:238]:
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    private boolean vertexIdEmpty(VertexLabel vertexLabel, Vertex vertex) {
        IdStrategy idStrategy = vertexLabel.idStrategy();
        if (idStrategy.isCustomizeString()) {
            Object vertexId = vertex.id();
            return vertexId == null || StringUtils.isEmpty((String) vertexId);
        }
        return false;
    }
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