Fix bug that routine load may mistakenly skipped some data #1832
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Reproduce: 1. start a routine load, send a routine load task to BE 2. BE executes task successfully and commit to FE. 3. Commit request failed on FE because database is renamed(throw db not found exception) 4. After commit failed, BE will send rollback request to FE. 5. FE receive this rollback request and mistakenly update the routine load progress, because the number of loaded rows in this rollback request's attachment is larger than 0
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Reproduce:
because the number of loaded rows in this rollback request's attachment is larger than 0