doctrine/dbal — pull request #554 by leonoff (2014-03-26 12:06:12+00:00)
Title: Add support string date modifiers for SqlitePlatform

In some cases we need support of non-numeric date(datetime) modifiers.
For example if we store interval-value-field in the table. Sqlite doesn't support '+field day' modifier. Common solution for this case is concatenate interval to a string: '+' || field || 'day'