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Current TestSuite is failing because of number of connection to the database.
The solution is to use "persistent connection", but this is not currently supported by Doctrine (see doctrine/dbal#2315) because setting ATTR_PERSISTENT conflict with ATTR_STATEMENT_CLASS.
nb: This issue has been fixed in Doctrine 3 (not yet released nor installable)
This PR patch doctrine to support persistent connection in PHP/symfony
note: Drawback is: caching results won't works anymore. Which not an issue in our case because caching result is not permitted in the benchmark.
This PR also replaces calls to aliases by a call to the original method. Less function calls === more performances. Tell me if you prefer a dedicated PR
ping @raziel057 @kaznovac