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MDEV-27544 database() function should return 64 characters
Database names are 64 utf8 characters per the system tables that refer to them. The current database() function is returning 34 characters. The result of limiting this function results to max length of 34 became apparent when used in a UNION ALL where the results are truncated to 34 characters. For (uninvestigated) reasons, SELECT DATABASE() on its own would always return the right number of characters. Thanks Alexander Barkov for the review. Thanks dave for noticing the bug in the stackexchange post https://dba.stackexchange.com/questions/306183/why-is-my-database-name-truncated
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