Thank you for your comment. We have recently upgraded the project from Kentico 12 to Kentico 13 which doesn't have the above column (ClassSearchIndexDataSource in CMS_Class). But, When we install kentico 13.0.56 as a fresh instance, the column is present in the CMS_Class table.
The current project version is on 13.0.56 and the CMS version is also 13.0.56 after migration from kentico 12.
Please refer the images
Let me know in case upgrading to 13.0.58 is the only option.