The failures are caused by the changes in PHP according to https://wiki.php.net/rfc/notice-for-non-valid-array-container.

Change "we're" to "where" in docblock for listTableColumns()
method. Add comma to improve readability.

The method is not used for anything else than skipping tests for specific drivers. Cross-driver portability should be established by drivers, not outside of them based on their name.

using params in query cache key generation.

fix two typos in QueryBuilder, on of them reported in #3479