ca436f0bae
As an example result:
```
./phpbench.phar run tests/Doctrine/Performance/Query --iterations=50 --revs=50 --report=aggregate
PhpBench 0.15-dev (dcbe193). Running benchmarks.
Using configuration file: /home/ocramius/Documents/doctrine/doctrine2/phpbench.json
\Doctrine\Performance\Query\QueryBoundParameterProcessingBench
benchExecuteParsedQueryWithInferredParameterTypeI49 P0 [μ Mo]/r: 643.684 634.664 (μs) [μSD μRSD]/r: 17.700μs 2.75%
benchExecuteParsedQueryWithDeclaredParameterTypeI49 P0 [μ Mo]/r: 97.673 94.251 (μs) [μSD μRSD]/r: 8.259μs 8.46%
2 subjects, 100 iterations, 100 revs, 0 rejects, 0 failures, 0 warnings
(best [mean mode] worst) = 88.460 [370.679 364.458] 127.400 (μs)
⅀T: 37,067.880μs μSD/r 12.980μs μRSD/r: 5.603%
suite: 133f0e30090f815142331ebec6af18241694e7c0, date: 2018-12-19, stime: 10:47:10
+------------------------------------+--------------------------------------------------+--------+--------+------+-----+------------+-----------+-----------+-----------+-----------+----------+--------+-------+
| benchmark | subject | groups | params | revs | its | mem_peak | best | mean | mode | worst | stdev | rstdev | diff |
+------------------------------------+--------------------------------------------------+--------+--------+------+-----+------------+-----------+-----------+-----------+-----------+----------+--------+-------+
| QueryBoundParameterProcessingBench | benchExecuteParsedQueryWithInferredParameterType | | [] | 50 | 50 | 5,970,568b | 604.680μs | 643.684μs | 634.664μs | 677.640μs | 17.700μs | 2.75% | 6.59x |
| QueryBoundParameterProcessingBench | benchExecuteParsedQueryWithDeclaredParameterType | | [] | 50 | 50 | 5,922,424b | 88.460μs | 97.673μs | 94.251μs | 127.400μs | 8.259μs | 8.46% | 1.00x |
+------------------------------------+--------------------------------------------------+--------+--------+------+-----+------------+-----------+-----------+-----------+-----------+----------+--------+-------+
```
This indicates that the performance impact for NOT declaring parameter types
explicitly is *MASSIVE*.
| Master | 2.5 |
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Doctrine 2 is an object-relational mapper (ORM) for PHP 7.1+ that provides transparent persistence for PHP objects. It sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernate's HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.