RowData removeMixedFormatMetaColumn(RowData rowData) {
    return MixedFormatUtils.removeMixedFormatMetaColumn(rowData, columnSize);
  }
@param rowData It may have more columns than readSchema. Refer to {@link
    FlinkUnkyedDataReader}'s annotation.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/reader/RowDataReaderFunction.java