perf(query-compiler): reduce filter extraction allocations

[tensordreams]

Stacked performance split from the ongoing Prisma Client performance work.

What changed:

• Reduces filter extraction allocations, including compound-selector checks and related parser/extractor helpers, without pulling in unrelated selection cleanups.

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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[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-filter-extraction-cleanups (ad9dd11) with main (1171e96)}

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	3.509MiB	3.508MiB	1.138KiB
Postgres (gzip)	1.143MiB	1.143MiB	449.000B
Postgres (size-optimized)	1.768MiB	1.767MiB	1.169KiB
Postgres (size-optimized, gzip)	696.372KiB	695.612KiB	778.000B
Mysql	3.462MiB	3.461MiB	1.151KiB
Mysql (gzip)	1.128MiB	1.128MiB	270.000B
Mysql (size-optimized)	1.738MiB	1.737MiB	1.222KiB
Mysql (size-optimized, gzip)	684.350KiB	684.338KiB	12.000B
Sqlite	3.380MiB	3.378MiB	1.138KiB
Sqlite (gzip)	1.100MiB	1.099MiB	735.000B
Sqlite (size-optimized)	1.694MiB	1.693MiB	1.217KiB
Sqlite (size-optimized, gzip)	667.871KiB	667.397KiB	485.000B
SQL Server	3.597MiB	3.596MiB	1.134KiB
SQL Server (gzip)	1.161MiB	1.161MiB	705.000B
SQL Server (size-optimized)	1.767MiB	1.766MiB	1.222KiB
SQL Server (size-optimized, gzip)	698.867KiB	698.453KiB	424.000B
CockroachDB	3.559MiB	3.558MiB	1.134KiB
CockroachDB (gzip)	1.163MiB	1.162MiB	637.000B
CockroachDB (size-optimized)	1.794MiB	1.792MiB	1.169KiB
CockroachDB (size-optimized, gzip)	706.550KiB	705.558KiB	1016.000B