Compiles the saved conditions for later retrieval.
This method does not return anything, but simply prepares data to be retrieved via __toString() and arguments().
$connection: The database connection for which to compile the conditionals.
$queryPlaceholder: The query this condition belongs to. If not given, the current query is used.
Overrides QueryConditionInterface::compile
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
return $this->query
->compile($connection, $queryPlaceholder);
}