Allow WHERE conditions to compare columns in same table

[andrew-walford-prisma]

Details TBA

SME: Flavian, Serhii

Eng. ticket: https://github.com/prisma/prisma/issues/5048 Notion doc: https://www.notion.so/prismaio/Allow-WHERE-conditions-to-compare-columns-in-same-table-6dac34efdf7b46ba916e7883217b9d84

Update 21 July - They're still investigating, but they're likely to choose proposal 3 or proposal 4 in the above Notion doc.