The following test case shows that mysql.tables_priv is wrongly populated
create user foo;
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create database some_db;
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create table some_db.t1 (a int, b int, secret int);
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create role r_select_column;
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create role r_active_column;
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grant r_select_column to r_active_column;
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grant r_active_column to foo;
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grant select(a) on some_db.t1 to r_select_column;
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select * from mysql.tables_priv order by user;
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Host Db User Table_name Grantor Timestamp Table_priv Column_priv
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some_db r_select_column t1 root@localhost 0000-00-00 00:00:00 Select
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grant insert(a) on some_db.t1 to r_active_column;
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select * from mysql.tables_priv order by user;
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Host Db User Table_name Grantor Timestamp Table_priv Column_priv
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some_db r_active_column t1 root@localhost 0000-00-00 00:00:00 Select, Insert
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some_db r_select_column t1 root@localhost 0000-00-00 00:00:00 Select
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-- There shouldn't be `Select` priv stored in Column_priv for r_active_column!
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The cause of this bug is the mixing of GRANT_TABLE::cols and GRANT_TABLE::init_cols within the mysql_table_grant function.
There is a similar bug for GRANT_COLUMN::rights and GRANT_COLUMN::init_rights.
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