hust-hhb opened a new pull request, #18161:
URL: https://github.com/apache/doris/pull/18161
when loading big file with multi bytes line delimiter, some line record
maybe incomplete because of `_output_buf_limit`, so this incomplete data will
move to the beginning of the output buf and read more data into output buf. In
this case, find line delimiter should start with no offset to avoid a bug that
spilt two lines as one line.
# Proposed changes
Issue Number: close #xxx
## Problem summary
Here is an example, the line delimiter is `^C^C^A`, and output buf remaining
data is
`YkRikHOZcAbf8bQS2PhHv3uk|ryowwwiVoFPL|-996021625^C`
the remaining data is incomplete line so move this data to the beginning of
the current output buf and read more data into output buf. So the output buf
may like this
```
YkRikHOZcAbf8bQS2PhHv3uk|ryowwwiVoFP|-996021625^C^C^A
P9wnGJ5BkPP4Zwo11RdmsWDN|8rKArr2FDVbu|-827465582^C^C^A
cist1Q6OAn7NQyAfBQ8rOciP|sFSiVvJcT05M
```
After last read buf, the offset will be at this point
```
offset
|
|
YkRikHOZcAbf8bQS2PhHv3uk|ryowwwiVoFP|-996021625^C^C^A
P9wnGJ5BkPP4Zwo11RdmsWDN|8rKArr2FDVbu|-827465582^C^C^A
cist1Q6OAn7NQyAfBQ8rOciP|sFSiVvJcT05M
```
If we find line delimiter start with offset, the next line delimiter will be
at this
```
YkRikHOZcAbf8bQS2PhHv3uk|ryowwwiVoFP|-996021625^C^C^A
P9wnGJ5BkPP4Zwo11RdmsWDN|8rKArr2FDVbu|-827465582^C^C^A
cist1Q6OAn7NQyAfBQ8rOciP|sFSiVvJcT05M |
|
line delimiter
```
and this will split tow line as one line, so find line delimiter should
start with no offset.
Describe your changes.
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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