setSqlType example

$item->setColumnType($config['columnType']);
                $item->setSupportText($config['supportText']);
                $item->setHelpText($config['helpText']);
                $item->setDisplayInBackend((bool) $config['displayInBackend']);
                $item->setReadonly((bool) $config['readonly']);
                $item->setLabel($config['label']);
                $item->setPosition((int) $config['position']);
                $item->setCustom((bool) $config['custom']);
                $item->setTranslatable((bool) $config['translatable']);
                $item->setConfigured(true);
                $item->setDbalType($column->getType()->getName());
                $item->setSqlType($this->typeMapping->unifiedToSQL($item->getColumnType()));
                $item->setEntity($config['entity']);
                $item->setArrayStore($config['arrayStore']);
                $item->setElasticSearchType($this->typeMapping->unifiedToElasticSearch($config['columnType']));
                $item->setDefaultValue($config['defaultValue'] === 'NULL' ? null : $config['defaultValue']);
            }
            $items[] = $item;
        }

        usort($items, function DConfigurationStruct $a, ConfigurationStruct $b) {
            if ($a->getPosition() === null && $b->getPosition() !== null) {
                return 1;
            }