executor: fix file exists errors in tests for select into outfile
(#19717)
#19725
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cherry-pick #19717 to release-4.0
What problem does this PR solve?
Issue Number: close #19718
Problem Summary: executor: fix file exists errors in tests for
select into outfile
What is changed and how it works?
Use random file names to avoid file name conflict.
Check List
Tests
Release note
select into outfile