Sergei Golubchik 547dfc0e01
MDEV-32500 Information schema leaks table names and structure to unauthorized users ...
standard table KEY_COLUMN_USAGE should only show keys where
a user has some privileges on every column of the key
standard table TABLE_CONSTRAINTS should show tables where
a user has any non-SELECT privilege on the table or on any column
of the table
standard table REFERENTIAL_CONSTRAINTS is defined in terms of
TABLE_CONSTRAINTS, so the same rule applies. If the user
has no rights to see the REFERENCED_TABLE_NAME value, it should be NULL
SHOW INDEX (and STATISTICS table) is non-standard, but it seems
reasonable to use the same logic as for KEY_COLUMN_USAGE.
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