perf: remove select before deleteMany

[Weakky]

Overview

fixes prisma/prisma#7232
fixes prisma/prisma#8239
fixes https://github.com/prisma/prisma-private/issues/217
fixes prisma/prisma#15085
fixes prisma/prisma#19950

On SQL connectors

We used to perform two SELECTs to fetch the ids to delete before passing these ids to the actual delete statement. This was causing several issues:

1. The SELECTs were superfluous
2. A transaction was required
3. The delete operation could mess up index usage because it wouldn't only be using the filter but also an IN clause with all the ids fetched by the SELECT. (cf issue above)

This PR fixes the problem by removing the SELECT altogether (on a top-level deleteMany). This makes it possible to remove the transaction entirely.

On MongoDB

We used to have duplicate selects before the delete. This is now fixed by passing the fetched ids down to the delete node in the graph. I'm unsure whether we can get rid of the select before the delete on Mongo because:

1. Joins aren't supported
2. More operators might not be supported and I need to verify. For now, we just solved the duplicate select issue.

SQL Diff

model Trade {
  id         Int
  marketId   Int      @db.SmallInt
  @@id([marketId, id])
}

mutation {
  deleteManyTrade(where: { marketId: 1, id: { lte: 10 } }) { count }
}

-- before
BEGIN
SELECT id FROM "Trade" WHERE marketId = 1 AND id <= 10
SELECT id FROM "Trade" WHERE marketId = 1 AND id <= 10 AND id IN (<...select ids>)
DELETE FROM "Trade" WHERE id IN (<...select ids>) AND marketId = 1 AND id <= 10
COMMIT

-- after
DELETE FROM "Trade" WHERE marketId = 1 AND id <= 10;

Benchmark

Datamodel:

model User {
  id Int @id @default(autoincrement())
  name String
}

Dataset size: 200k users

Query:

mutation {
  deleteManyUser(where: { id: {gt: 50000 }, name: { lt: { 'g' } } } { count }
}

Result:

Before: 387.930 ± 42.506ms
After: 62.992 ± 21.071ms

[codspeed-hq]

CodSpeed Performance Report

Merging #4249 will improve performances by 5.67%

_{Comparing perf/delete-many-redundant-select (1fa92cb) with main (5c9823b)}

Summary

⚡ 1 improvements
✅ 10 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	perf/delete-many-redundant-select	Change
⚡	large_read	7.7 ms	7.3 ms	+5.67%

[miguelff]

Outstanding!

[miguelff]

📉