[Fix](Export) Export delete multiple times when specify the delete_existing_files property ()
#39304
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bp: #38400
When the
Exportstatement specifies thedelete_existing_filesproperty, eachOutfilestatement generated by theExportwill carry this property. This causes eachOutfilestatement to delete existing files, so only the result of the last Outfile statement will be retained.So, we add a rpc method which can delete existing files for
Exportstatement and theOutfilestatements generated by theExportwill not carrydelete_existing_filesproperty any more.Proposed changes
Issue Number: close #xxx