perf(query-compiler): prune connect-or-create branches

[tensordreams]

Stacked performance split from the ongoing Prisma Client performance work.

What changed:

• Stacks on empty required set pruning and trims connect-or-create branch scaffolding where create/connect results can be joined or passed through directly.

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

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• Create PR with unit tests
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• Commit simplified code in branch prisma-client-perf-coc-branch-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

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_{Comparing prisma-client-perf-coc-branch-pruning (9a426d2) with prisma-client-perf-empty-required-set-pruning (cb760e9)}

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. ↩

[github-actions]

Wasm Query Compiler File Size

Engine	This PR	Base branch	Diff
Postgres	3.552MiB	3.553MiB	-907.000B
Postgres (gzip)	1.160MiB	1.160MiB	-150.000B
Postgres (size-optimized)	1.785MiB	1.785MiB	-107.000B
Postgres (size-optimized, gzip)	702.772KiB	702.887KiB	-118.000B
Mysql	3.505MiB	3.505MiB	-907.000B
Mysql (gzip)	1.144MiB	1.144MiB	-269.000B
Mysql (size-optimized)	1.755MiB	1.755MiB	-109.000B
Mysql (size-optimized, gzip)	691.497KiB	691.519KiB	-23.000B
Sqlite	3.422MiB	3.423MiB	-907.000B
Sqlite (gzip)	1.115MiB	1.115MiB	-100.000B
Sqlite (size-optimized)	1.710MiB	1.711MiB	-107.000B
Sqlite (size-optimized, gzip)	674.083KiB	674.124KiB	-42.000B
SQL Server	3.640MiB	3.641MiB	-901.000B
SQL Server (gzip)	1.177MiB	1.177MiB	55.000B
SQL Server (size-optimized)	1.783MiB	1.783MiB	-107.000B
SQL Server (size-optimized, gzip)	705.399KiB	705.334KiB	67.000B
CockroachDB	3.602MiB	3.603MiB	-901.000B
CockroachDB (gzip)	1.178MiB	1.179MiB	-192.000B
CockroachDB (size-optimized)	1.810MiB	1.810MiB	-107.000B
CockroachDB (size-optimized, gzip)	712.487KiB	712.418KiB	70.000B