Jira issue originally created by user sbeining:
The MySQL SchemaManager can not properly generate a Schema from the database if a table has a foreign key that spans multiple columns.
Therefore the comparator tries to drop the one index as individual indexes.
That leads to an error if the resulting SQL is executed because these indexes do not exist (i.e. via app/console doctrine:schema:update --force)
ALTER TABLE table1 DROP FOREIGN KEY FK_C1B1712387FE737264DE5A5511B8B3E;
DROP INDEX IDX_C1B1712387FE7372 ON table1;
DROP INDEX IDX_C1B1712364DE5A5 ON table1;
DROP INDEX IDX_C1B17123511B8B3E ON table1;
ALTER TABLE table1 ADD CONSTRAINT FK_C1B1712387FE737264DE5A5511B8B3E FOREIGN KEY (column1, column2, column3) REFERENCES table2(column1, column2, column3);
Issue was closed with resolution "Fixed"