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Column type cannot be auto-increment for small int types

switch type {

    case self::TYPE_INTEGER:
    case self::TYPE_BIGINTEGER:
            let this->_autoIncrement = true;

            throw new Exception("Column type cannot be auto-increment");

Why we can't use smaller integer types as AI?

well it's right, we should add tinyint, smallint and medimumint. Create an issue in github

Good luck