public InLongMsgBinlog metadataFieldName(String metadataFieldName) {
        checkNotNull(metadataFieldName);
        internalProperties.putString(FORMAT_METADATA_FIELD_NAME, metadataFieldName);
        return this;
    }
Sets the name of the metadata field.

@param metadataFieldName The name of the metadata field.
inlong-sort/sort-formats/format-row/format-inlongmsg-binlog/src/main/java/org/apache/inlong/sort/formats/inlongmsgbinlog/InLongMsgBinlog.java