PRS-215: Emit jsonb_build_object with 50-pair chunking in Postgres adapter by prisma-gremlin[bot] · Pull Request #999 · prisma/prisma-next

prisma-gremlin · 2026-07-16T17:25:01Z

Requested by Alexey Orlenko · Slack thread

What & why

The Postgres adapter's renderJsonObjectExpr previously emitted a single json_build_object(...) call with all key/value pairs inline. PostgreSQL caps function-call arguments at 100, so an object with more than 50 key/value pairs (100 args) would error at runtime. This switches the render path to jsonb_build_object and batches entries 50 key/value pairs per call, merging the per-chunk objects with the JSONB || concatenation operator. JSONB is required because || concatenation is only defined on jsonb, not plain json.

For 50 or fewer pairs, a single jsonb_build_object(...) call is emitted with no || — same shape as before, just jsonb instead of json.

Changes

packages/3-targets/6-adapters/postgres/src/core/sql-renderer.ts — renderJsonObjectExpr now renders jsonb_build_object, chunking entries into batches of 50 pairs and joining batches with ||.
packages/3-targets/6-adapters/postgres/README.md — prose updated from json_build_object to jsonb_build_object, plus a note describing the chunking behavior and the 100-argument cap rationale.
packages/3-targets/6-adapters/postgres/test/adapter.test.ts — fixed an existing assertion that still expected json_build_object; added two tests covering the ≤50-field case (single call, no ||) and the >50-field case (multiple calls merged with ||, each holding ≤50 key/value pairs).
packages/3-extensions/pgvector/test/rich-adapter.test.ts — fixed the rich-adapter assertion that still expected json_build_object.
docs/architecture docs/subsystems/3. Query Lanes.md — render-path doc updated to reflect jsonb_build_object and the chunking behavior (doc-maintenance rule).

Prior art & tracking

Mirrors the approach from prisma-engines#4555. Tracks Linear issue PRS-215.

Created by Mohawk

Summary by CodeRabbit

New Features
- PostgreSQL JSON aggregation now uses JSONB for improved compatibility and merging support.
- Large JSON objects are automatically split into manageable chunks and combined safely.
- Empty JSON objects are rendered correctly using PostgreSQL JSONB syntax.
Documentation
- Updated SQL DSL and PostgreSQL adapter documentation with the new JSONB aggregation behavior and large-object handling details.

…apter renderJsonObjectExpr now emits jsonb_build_object instead of json_build_object, batching entries at 50 key/value pairs per call (100 args, Postgres' function-call argument cap) and merging per-chunk objects with the JSONB || concatenation operator. Objects of 50 or fewer pairs render a single call with no concatenation. Updates the adapter README prose and the Query Lanes subsystem doc, fixes the pgvector rich-adapter assertion that still expected json_build_object, and adds adapter tests covering the <=50 and >50-field chunking cases. Refs: PRS-215, prisma-engines#4555 Signed-off-by: Gremlin <gremlin[bot]@users.noreply.github.com>

coderabbitai · 2026-07-16T17:25:22Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

Run ID: bfc59a66-67f4-4e5a-b634-32a31e074b8a

📥 Commits

Reviewing files that changed from the base of the PR and between 98cf9c0 and ac99826.

📒 Files selected for processing (5)

docs/architecture docs/subsystems/3. Query Lanes.md
packages/3-extensions/pgvector/test/rich-adapter.test.ts
packages/3-targets/6-adapters/postgres/README.md
packages/3-targets/6-adapters/postgres/src/core/sql-renderer.ts
packages/3-targets/6-adapters/postgres/test/adapter.test.ts

📝 Walkthrough

Walkthrough

The PostgreSQL SQL renderer now uses jsonb_build_object, splits objects into chunks of up to 50 pairs, and merges chunks with ||. Adapter tests, rich adapter assertions, architecture documentation, and the PostgreSQL README reflect the updated rendering.

Changes

PostgreSQL JSONB rendering

Layer / File(s)	Summary
JSONB rendering and coverage `packages/3-targets/6-adapters/postgres/src/core/sql-renderer.ts`, `packages/3-targets/6-adapters/postgres/test/adapter.test.ts`	JSON object expressions render with `jsonb_build_object`, including chunking into groups of up to 50 pairs joined by `
JSONB rendering documentation and integration `packages/3-targets/6-adapters/postgres/README.md`, `docs/architecture docs/subsystems/3. Query Lanes.md`, `packages/3-extensions/pgvector/test/rich-adapter.test.ts`	Documentation and rich adapter expectations describe and assert JSONB aggregation and wide-object merging behavior.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: wmadden

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: switching to jsonb_build_object with 50-pair chunking in the Postgres adapter.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

Create stacked PR
Commit on current branch

🧪 Generate unit tests (beta)

Create PR with unit tests
Commit unit tests in branch PRS-215-postgres-jsonb-build-object-chunking

_{Comment @coderabbitai help to get the list of available commands.}

github-actions · 2026-07-16T17:28:00Z

size-limit report 📦

Path	Size
postgres / no-emit	159.04 KB (+0.05% 🔺)
postgres / emit	132.57 KB (+0.06% 🔺)
mongo / no-emit	98.71 KB (0%)
mongo / emit	89.43 KB (0%)
cf-worker / no-emit	185.21 KB (+0.04% 🔺)
cf-worker / emit	155.97 KB (+0.05% 🔺)

pkg-pr-new · 2026-07-16T17:28:10Z

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commit: ac99826

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PRS-215: Emit jsonb_build_object with 50-pair chunking in Postgres adapter#999

PRS-215: Emit jsonb_build_object with 50-pair chunking in Postgres adapter#999
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