PROCEDURE
The PROCEDURE clause of SELECT passes the whole result set to a Procedure which will process it. These Procedures are not Stored Procedures, and can only be written in the C language, so it is necessary to recompile the server.
Currently, the only available procedure is ANALYSE, which examines the resultset and suggests the optimal datatypes for each column. It is defined in the sql/sql_analyse.cc file, and can be used as an example to create more Procedures.
This clause cannot be used in a view's definition.
See Also
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https://mariadb.com/kb/en/procedure/