[Fix][Connector-V2] Fix doris sink can not be closed when stream load not read any data #6570
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Purpose of this pull request
This PR fix doris stream load thread not read any data cause writer can not write data into buffer. Finally writer can not check exception because the thread stucked.
Does this PR introduce any user-facing change?
no
How was this patch tested?
tested in local. hard to add test case.
Check list
New License Guide
release-note
.