Handle column count change in PDO MySQL

This has been fixed for PDO SQlite by GH-4313, however the same
issue also applied to PDO MySQL.

Move the column count setting function i

Handle column count change in PDO MySQL

This has been fixed for PDO SQlite by GH-4313, however the same
issue also applied to PDO MySQL.

Move the column count setting function into the main PDO layer
(and export it) and then use it in both PDO SQLite and PDO MySQL.

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