flink-cdc-connect/flink-cdc-source-connectors/flink-connector-debezium/src/main/java/org/apache/flink/cdc/debezium/table/RowDataDebeziumDeserializeSchema.java [662:676]:
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    private static DeserializationRuntimeConverter wrapIntoNullableConverter(
            DeserializationRuntimeConverter converter) {
        return new DeserializationRuntimeConverter() {

            private static final long serialVersionUID = 1L;

            @Override
            public Object convert(Object dbzObj, Schema schema) throws Exception {
                if (dbzObj == null) {
                    return null;
                }
                return converter.convert(dbzObj, schema);
            }
        };
    }
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flink-cdc-connect/flink-cdc-source-connectors/flink-connector-debezium/src/main/java/org/apache/flink/cdc/debezium/event/DebeziumEventDeserializationSchema.java [423:437]:
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    private static DeserializationRuntimeConverter wrapIntoNullableConverter(
            DeserializationRuntimeConverter converter) {
        return new DeserializationRuntimeConverter() {

            private static final long serialVersionUID = 1L;

            @Override
            public Object convert(Object dbzObj, Schema schema) throws Exception {
                if (dbzObj == null) {
                    return null;
                }
                return converter.convert(dbzObj, schema);
            }
        };
    }
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