perf: use serde_json_borrow for Synth output

[meskill]

Summary:
Replace using only async_graphql_value::ConstValue with serde_json_borrow::Value for the Sync output. Evaluation and store left intact and that uses ConstValue as before.

Issue Reference(s):
Fixes #... (Replace "..." with the issue number)

Build & Testing:

• [ ] I ran cargo test successfully.
• [ ] I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• [ ] I have added relevant unit & integration tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have performed a self-review of my code.
• [ ] PR follows the naming convention of <type>(<optional scope>): <title>

[meskill]

Wrk changes

posts title

before

Running 30s test @ http://localhost:8000/graphql
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.47ms   13.49ms 360.82ms   99.24%
    Req/Sec    17.39k     1.85k   22.15k    86.81%
  2075331 requests in 30.09s, 10.40GB read
Requests/sec:  68973.83
Transfer/sec:    354.02MB

serde_json_borrow

Running 30s test @ http://localhost:8000/graphql
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.50ms   14.78ms 397.01ms   99.22%
    Req/Sec    18.43k     2.19k   21.42k    89.15%
  2203809 requests in 29.23s, 11.05GB read
  Socket errors: connect 0, read 0, write 0, timeout 100
Requests/sec:  75406.44
Transfer/sec:    387.04MB

big query

before

Running 30s test @ http://localhost:8000/graphql
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     9.46ms    4.02ms 100.68ms   85.24%
    Req/Sec     2.70k   332.08     5.14k    86.24%
  322219 requests in 30.09s, 15.94GB read
Requests/sec:  10708.26
Transfer/sec:    542.35MB

serde_json_borrow

Running 30s test @ http://localhost:8000/graphql
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     9.07ms    3.22ms  90.35ms   77.74%
    Req/Sec     2.79k   323.80     3.60k    82.50%
  333021 requests in 30.08s, 16.47GB read
Requests/sec:  11072.28
Transfer/sec:    560.79MB

[meskill]

Flamegraphs

posts title

insert_key from 4.44% to 1.3%

big query

insert_key from 4.96% to 0.94%

[meskill]

The performance difference is noticeable, but for the big queries the impact is lower showing only around 3% improvement.

And this pr needs several more fixes to work because right now it's only possible to run the benchmarks and tests are failing:

• implement clone_from for case of object. The clone_from is introduced to be able to clone from one JsonLike to another JsonLike
• implement merge for instrospection query because we have different JsonLike entries now and it should be merged differently like it was with ConstValue
• fix the tests related to changes in exec signature

[github-actions[bot]]

Bencher Report

Branch	3073/merge
Testbed	benchmarking-runner

⚠️ WARNING: No Threshold found!

Without a Threshold, no Alerts will ever be generated.

• Latency (nanoseconds (ns))

Click here to create a new Threshold
For more information, see the Threshold documentation.
To only post results if a Threshold exists, set the --ci-only-thresholds CLI flag.

Click to view all benchmark results

Benchmark	Latency	nanoseconds (ns)
from_json_bench	📈 view plot ⚠️ NO THRESHOLD	6,226,600.00
group_by	📈 view plot ⚠️ NO THRESHOLD	483.15
input/args.missing	📈 view plot ⚠️ NO THRESHOLD	22.10
input/args.nested.existing	📈 view plot ⚠️ NO THRESHOLD	41.22
input/args.nested.missing	📈 view plot ⚠️ NO THRESHOLD	35.48
input/args.root	📈 view plot ⚠️ NO THRESHOLD	37.55
input/headers.existing	📈 view plot ⚠️ NO THRESHOLD	30.62
input/headers.missing	📈 view plot ⚠️ NO THRESHOLD	29.85
input/value.missing	📈 view plot ⚠️ NO THRESHOLD	21.95
input/value.nested.existing	📈 view plot ⚠️ NO THRESHOLD	41.44
input/value.nested.missing	📈 view plot ⚠️ NO THRESHOLD	36.17
input/value.root	📈 view plot ⚠️ NO THRESHOLD	41.55
input/vars.existing	📈 view plot ⚠️ NO THRESHOLD	8.09
input/vars.missing	📈 view plot ⚠️ NO THRESHOLD	10.67
synth_nested	📈 view plot ⚠️ NO THRESHOLD	103,120.00
synth_nested_borrow	📈 view plot ⚠️ NO THRESHOLD	39,614.00
test_batched_body	📈 view plot ⚠️ NO THRESHOLD	1,859.40
test_batched_body #2	📈 view plot ⚠️ NO THRESHOLD	1,517,900.00
test_data_loader	📈 view plot ⚠️ NO THRESHOLD	391,500.00
test_handle_request	📈 view plot ⚠️ NO THRESHOLD	128,840.00
test_handle_request_jit	📈 view plot ⚠️ NO THRESHOLD	51,684.00
test_http_execute_method	📈 view plot ⚠️ NO THRESHOLD	15,637.00
with_mustache_expressions	📈 view plot ⚠️ NO THRESHOLD	1,111.50
with_mustache_literal	📈 view plot ⚠️ NO THRESHOLD	695.59

🐰 View full continuous benchmarking report in Bencher

[meskill]

The performance difference is noticeable, but for the big queries the impact is lower showing only around 3% improvement.

And this pr needs several more fixes to work because right now it's only possible to run the benchmarks and tests are failing:

• implement clone_from for case of object. The clone_from is introduced to be able to clone from one JsonLike to another JsonLike
• implement merge for instrospection query because we have different JsonLike entries now and it should be merged differently like it was with ConstValue
• fix the tests related to changes in exec signature

fixed in recent commits

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 65.47085% with 77 lines in your changes missing coverage. Please review.

Project coverage is 86.74%. Comparing base (c9bef7a) to head (a48b129). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/json/serde.rs	9.09%	30 Missing :warning:
src/core/json/json_like.rs	46.15%	21 Missing :warning:
src/core/json/borrow.rs	60.60%	13 Missing :warning:
src/core/json/graphql.rs	81.48%	5 Missing :warning:
src/core/jit/exec_const.rs	82.60%	4 Missing :warning:
src/core/jit/synth/synth.rs	93.18%	3 Missing :warning:
src/core/jit/response.rs	94.11%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3073 +/- ## ========================================== - Coverage 86.89% 86.74% -0.16% ========================================== Files 275 275 Lines 26896 27052 +156 ========================================== + Hits 23372 23466 +94 - Misses 3524 3586 +62 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[github-actions[bot]]

Action required: PR inactive for 5 days. Status update or closure in 10 days.