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When the upgrade process fails due to missing either one of the files, innodb_index_stats.ibd and innodb_table_stats.ibd, the same misleading error was logged: "Error in renaming mysql_index_stats_ibd".
To correctly log the error, separate the messages for missing innodb_{index,table}_stats.ibd files to two variables, and use the corresponding variable during upgrade process.
All new code of the whole pull request, including one or several files that are either new files or modified ones, are contributed under the BSD-new license. I am contributing on behalf of my employer Amazon Web Services, Inc.