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Failing to connect would release parts of the MYSQL struct. We would then proceed to try again to connect without re- initializing the struct. We prevent the unwanted freeing of data we'll still need now. client/mysqladmin.cc: Losing a connection (or not even getting on in the first place) should not trash the MYSQL-struct. Add a lot of comments. Rewrite re-connection fu. sql-common/client.c: Assert against bad parameters usually caused by de-initing a MYSQL-struct without re-initing it again before re-use.