feat(drizzle): support mixed has-many/single select in polymorphic join where

[r1tsuu]

Written by AI

Draft. Follow-up to 9339d63 (PYLD-3840). Partially restores one of the polymorphic-join where shapes that PR made fail-closed, and documents a secure plan for the rest.

What this restores

A select field that is stored has-many (separate value rows) in one polymorphic target collection and as a single select column in another — when the targets share identical option values. This is the common case of the same logical field declared hasMany in one collection but not another.

Each branch is compiled per-collection with its own storage handler (has-many → JSON value-table subquery; single → scalar column) and unioned on the stable id/relationTo/sort projection, so the combined caller + access where is applied in full to every branch — nothing dropped or truncated (no PYLD-3840 regression). Two rejects.toThrow mixed-shape tests are flipped to positive filtering assertions that prove the constraint includes the authorized has-many row and excludes the unauthorized scalar row.

Shapes that cannot be compiled soundly stay fail-closed: text-vs-number scalars, differing option sets, unsupported operators.

Still deferred (with a plan)

polymorphic-join-where-support-plan.md (included) gives per-category secure implementation plans for the remaining shapes: localized fields, array/blocks, relationship/upload/json traversal, and geo operators — each via per-branch correlated EXISTS/NOT EXISTS subqueries, with the invariants tied back to the exact PYLD-3840 exploit class they prevent.

Verification

• Unit (packages/drizzle/src/find): 82 pass
• test/joins/int.spec.ts: 114 pass / 7 skip (sqlite), 121 pass (postgres)

Independently re-run and confirmed. Left as a draft for review — not for merge.

---

3.x backport: #18235

[github-actions]

📦 esbuild Bundle Analysis for payload

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Details

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• ✅: No change or even downsized.
• 🗑️: The out file is deleted: not found in base branch.
• 🆕: The out file is newly found: will be added to base branch.