Postgres: substring('foobar' from 2 for 3) 2-nd version #71
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Еще один вариант сделать выражение в заголовке (см. также #69). В этот раз это можно сделать указав Binary-, PostfixUnary-, PrefixUnary-Expression'ам не оборачивать свое выражение в скобки.
Пример использования в добавленных тестах.
Как бонус пофиксил не передаваемый alias' SQLFunction'а в случае если оно работает через Criteria. Сделано по аналогии с agregate, но попахивает php хаком :)