private Schema wrapFileOffsetColumnMeta(Schema schema) {
    return changeWriteSchema(schema);
  }
The index of the mixed-format file offset field in the read schema Refer to {@link
this#wrapFileOffsetColumnMeta}
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/reader/RowDataReaderFunction.java