When I run the Setup Upgrade Command. Getting below error
Notice: Undefined index: column in /vendor/magento/framework/Setup/Declaration/Schema/Declaration/SchemaBuilder.php on line 196
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I've often ran into various errors when upgrading from 2.3.3 to 2.3.4. I'd suggest removing the vendor folder and re-running a composer install.
Before deleting the vendor folder, take a backup first to be safe.
sudo tar -zcvf ~/ecocraftvendor.tar.gz vendor
(places the zip folder into your home directory)
Remove vendor folders
sudo rm vendor/* -rf
sudo su php7.2 /usr/bin/composer install
sudo php7.2 bin/magento setup:upgrade sudo php7.2 bin/magento setup:di:compile
Flush cache/sort permissions etc.