session: fix show variable result of tidb_enable_window_function after upgrade (#13866)
#14131
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cherry-pick #13866 to release-3.0
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What problem does this PR solve?
tidb_enable_window_functionwill display as1inshow variables's result after upgrade from old version, but realtidb_enable_window_functionvalue will keep 0 due to keep syntax compatibility， on another hand, new cluster can safe use1as default value.What is changed and how it works?
when upgrade from old version, insert a default 0 value if no exists record in
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show variableresult oftidb_enable_window_functionafter upgradeThis change is