protected function _buildColumn($field) {
		extract($field);

		if ($type === 'float' && $precision) {
			$use = 'numeric';
		}

		$out = $this->name($name) . ' ' . $use;

		$allowPrecision = preg_match('/^(integer|real|numeric)$/',$use);
		$precision = ($precision && $allowPrecision) ? ",{$precision}" : '';

		if ($length && ($allowPrecision || $use === 'text')) {
			$out .= "({$length}{$precision})";
		}

		$out .= $this->_buildMetas('column', $field, ['collate']);

		if ($type !== 'id') {
			$out .= is_bool($null) ? ($null ? ' NULL' : ' NOT NULL') : '' ;
			$out .= $default ? ' DEFAULT ' . $this->value($default, $field) : '';
		}

		return $out;
	}