hugegraph-spark-connector/src/main/java/org/apache/hugegraph/spark/connector/builder/EdgeBuilder.java [121:134]:
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    private void checkIdFields(VertexLabel vertexLabel, List<String> fields) {
        if (vertexLabel.idStrategy().isCustomize()) {
            E.checkArgument(fields.size() == 1,
                            "The source/target field can contains only one " +
                            "column when id strategy is CUSTOMIZE");
        } else if (vertexLabel.idStrategy().isPrimaryKey()) {
            E.checkArgument(fields.size() >= 1,
                            "The source/target field must contains some " +
                            "columns when id strategy is PrimaryKey");
        } else {
            throw new IllegalArgumentException("Unsupported AUTOMATIC id strategy " +
                                               "for hugegraph Spark Connector.");
        }
    }
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hugegraph-loader/src/main/java/org/apache/hugegraph/loader/builder/EdgeBuilder.java [194:207]:
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    private void checkIdFields(VertexLabel vertexLabel, List<String> fields) {
        if (vertexLabel.idStrategy().isCustomize()) {
            E.checkArgument(fields.size() == 1,
                            "The source/target field can contains only one " +
                            "column when id strategy is CUSTOMIZE");
        } else if (vertexLabel.idStrategy().isPrimaryKey()) {
            E.checkArgument(fields.size() >= 1,
                            "The source/target field must contains some " +
                            "columns when id strategy is PrimaryKey");
        } else {
            throw new IllegalArgumentException("Unsupported AUTOMATIC id strategy " +
                                               "for hugegraph-loader");
        }
    }
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