Comments - INSTALL SONAME
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All plugins are installed. UDF are not installed. Plugins are listed in mariadb_decalre_plugin. UDFs cannot be installed automatically because they are not listed anywhere and because they don't store their metadata — the server doesn't know what arguments the UDF needs, its return type, and so on.
UDFs are simply a set of functions in the .so library. And they are ignored by INSTALL SONAME.