hailin0 commented on code in PR #8109:
URL: https://github.com/apache/seatunnel/pull/8109#discussion_r1855702480


##########
docs/en/connector-v2/source/SftpFile.md:
##########
@@ -94,6 +94,7 @@ The File does not have a specific type list, and we can 
indicate which SeaTunnel
 | compress_codec            | String  | No       | None                | The 
compress codec of files and the details that supported as the following shown: 
<br/> - txt: `lzo` `None` <br/> - json: `lzo` `None` <br/> - csv: `lzo` `None` 
<br/> - orc: `lzo` `snappy` `lz4` `zlib` `None` <br/> - parquet: `lzo` `snappy` 
`lz4` `gzip` `brotli` `zstd` `None` <br/> Tips: excel type does Not support any 
compression format                            |
 | archive_compress_codec    | string  | no       | none                |
 | encoding                  | string  | no       | UTF-8               |
+| null_format               | string  | no       | -                   | Only 
used when file_format_type is text. null_format to define which strings can be 
represented as null.                                                            
                                                                                
                                                                                
                                            |

Review Comment:
   
[example](https://stackoverflow.com/questions/43556160/null-data-converted-into-n-for-numeric-columns-in-hive)
   
   
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=27362034#LanguageManualDDL-StorageFormatsStorageFormatsRowFormat,StorageFormat,andSerDe
   
   https://github.com/alibaba/DataX/blob/master/hdfsreader/doc/hdfsreader.md
   



##########
docs/en/connector-v2/source/SftpFile.md:
##########
@@ -94,6 +94,7 @@ The File does not have a specific type list, and we can 
indicate which SeaTunnel
 | compress_codec            | String  | No       | None                | The 
compress codec of files and the details that supported as the following shown: 
<br/> - txt: `lzo` `None` <br/> - json: `lzo` `None` <br/> - csv: `lzo` `None` 
<br/> - orc: `lzo` `snappy` `lz4` `zlib` `None` <br/> - parquet: `lzo` `snappy` 
`lz4` `gzip` `brotli` `zstd` `None` <br/> Tips: excel type does Not support any 
compression format                            |
 | archive_compress_codec    | string  | no       | none                |
 | encoding                  | string  | no       | UTF-8               |
+| null_format               | string  | no       | -                   | Only 
used when file_format_type is text. null_format to define which strings can be 
represented as null.                                                            
                                                                                
                                                                                
                                            |

Review Comment:
   
https://stackoverflow.com/questions/43556160/null-data-converted-into-n-for-numeric-columns-in-hive
   
   
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=27362034#LanguageManualDDL-StorageFormatsStorageFormatsRowFormat,StorageFormat,andSerDe
   
   https://github.com/alibaba/DataX/blob/master/hdfsreader/doc/hdfsreader.md
   



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