framework/db/conditions/BetweenConditionBuilder.php
public function build(ExpressionInterface $expression, array &$params = [])
    {
        $operator = $expression->getOperator();
        $column = $expression->getColumn();

        if (strpos($column, '(') === false) {
            $column = $this->queryBuilder->db->quoteColumnName($column);
        }

        $phName1 = $this->createPlaceholder($expression->getIntervalStart(), $params);
        $phName2 = $this->createPlaceholder($expression->getIntervalEnd(), $params);

        return "$column $operator $phName1 AND $phName2";
    }
public function build(ExpressionInterface $expression, array &$params = [])
    {
        $operator = $expression->getOperator();
        $column = $expression->getColumn();

        if (strpos($column, '(') === false) {
            $column = $this->queryBuilder->db->quoteColumnName($column);
        }

        $phName1 = $this->createPlaceholder($expression->getIntervalStart(), $params);
        $phName2 = $this->createPlaceholder($expression->getIntervalEnd(), $params);

        return "$column $operator $phName1 AND $phName2";
    }
Method builds the raw SQL from the $expression that will not be additionally
escaped or quoted.

@param ExpressionInterface|BetweenCondition $expression the expression to be built.
@param array $params the binding parameters.
@return string the raw SQL that will not be additionally escaped or quoted.