perf(query-compiler): specialize empty required set paths

[tensordreams]

Stacked performance split from the ongoing Prisma Client performance work.

What changed:

• Stacks on required set pruning and specializes empty required set paths to avoid redundant graph phases.

Why:

• Keeps this review unit small while preserving the measured allocation/runtime cleanup from the larger performance branch.

Validation:

• See wip/client-performance-pr-stack.md on the Prisma status branch for the exact local check set recorded for this split.

CI linkage:
/prisma-branch prisma-client-performance-2026-06-08

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch prisma-client-perf-empty-required-set-pruning

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• Create PR with simplified code
• Commit simplified code in branch prisma-client-perf-empty-required-set-pruning

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[CLAassistant]

All committers have signed the CLA.

[codspeed-hq]

Merging this PR will not alter performance

✅ 11 untouched benchmarks
⏩ 11 skipped benchmarks¹

---

_{Comparing prisma-client-perf-empty-required-set-pruning (cb760e9) with main (1171e96)²}

Footnotes

1. 11 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on prisma-client-perf-required-set-pruning (335dbb0) during the generation of this report, so main (1171e96) was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[github-actions]

Wasm Query Compiler File Size

Engine	This PR	Base branch	Diff
Postgres	3.553MiB	3.551MiB	1.770KiB
Postgres (gzip)	1.160MiB	1.159MiB	1.160KiB
Postgres (size-optimized)	1.785MiB	1.784MiB	784.000B
Postgres (size-optimized, gzip)	702.881KiB	702.848KiB	34.000B
Mysql	3.505MiB	3.504MiB	1.762KiB
Mysql (gzip)	1.144MiB	1.144MiB	506.000B
Mysql (size-optimized)	1.755MiB	1.754MiB	784.000B
Mysql (size-optimized, gzip)	691.519KiB	691.397KiB	125.000B
Sqlite	3.423MiB	3.422MiB	1.762KiB
Sqlite (gzip)	1.115MiB	1.115MiB	440.000B
Sqlite (size-optimized)	1.711MiB	1.710MiB	776.000B
Sqlite (size-optimized, gzip)	674.125KiB	673.956KiB	173.000B
SQL Server	3.641MiB	3.639MiB	1.658KiB
SQL Server (gzip)	1.177MiB	1.176MiB	270.000B
SQL Server (size-optimized)	1.783MiB	1.783MiB	784.000B
SQL Server (size-optimized, gzip)	705.333KiB	705.254KiB	80.000B
CockroachDB	3.603MiB	3.601MiB	1.658KiB
CockroachDB (gzip)	1.179MiB	1.178MiB	288.000B
CockroachDB (size-optimized)	1.810MiB	1.809MiB	776.000B
CockroachDB (size-optimized, gzip)	712.417KiB	712.176KiB	246.000B