private GenericRowData extractBeforeRow(Struct value, Schema valueSchema) throws Exception {
        Schema beforeSchema = valueSchema.field(Envelope.FieldName.BEFORE).schema();
        Struct before = value.getStruct(Envelope.FieldName.BEFORE);
        return (GenericRowData) physicalConverter.convert(before, beforeSchema);
    }
Initialize the source metric data.
Must be called on flink cluster rather than flink client
Since the audit operator is not serializable
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/mysql/RowDataDebeziumDeserializeSchema.java