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Closes #3257: Port 'PR #3249' to v2.1.1 #3258

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JavierJF
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Closes #3257.

renecannao and others added 8 commits January 19, 2021 19:40
In mysql_init() charset is set to NULL .
In mysql_read_connect() charset is not changed if already set

This allows proxysql to change it outside the library
This is an extension of commit 1ecb00f about mysql_real_connect

It also changes mysql_optionsv() for MYSQL_SET_CHARSET_NAME
… charset if collation ID is greater or equal than 255 (utf8mb4_0900_ai_ci)

We call mysql_options with MYSQL_SET_CHARSET_NAME if collation ID >= 255 .
This to solve the problem of MySQL server returning an Access denied if the backend doesn't support a collation during mysql_change_user
…erly setting collation specified by the client
@renecannao
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Closing this because already ported in #3286

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