docs: add hybrid search documentation to PGVectorStore

[dishaprakash]

Adding documentation for Hybrid Search in the PGVectorStore Notebook

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ready	Preview	Comment	Sep 12, 2025 1:24am

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32549 will degrade performances by 16.45%

_{Comparing dishaprakash:hybrid-search-pgvectorstore (27b5543) with master (15d558f)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

❌ 12 regressions
✅ 1 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_import_time[BaseChatModel]	519.8 ms	597 ms	-12.93%
❌	test_import_time[CallbackManager]	446.3 ms	515.2 ms	-13.38%
❌	test_import_time[ChatPromptTemplate]	606.4 ms	712.4 ms	-14.88%
❌	test_import_time[Document]	210.7 ms	239.7 ms	-12.11%
❌	test_import_time[HumanMessage]	210.4 ms	236.8 ms	-11.17%
❌	test_import_time[InMemoryRateLimiter]	165.2 ms	188.2 ms	-12.21%
❌	test_import_time[InMemoryVectorStore]	607.2 ms	709.2 ms	-14.38%
❌	test_import_time[LangChainTracer]	423.6 ms	480.6 ms	-11.86%
❌	test_import_time[PydanticOutputParser]	536 ms	632.8 ms	-15.29%
❌	test_import_time[RunnableLambda]	473.7 ms	551.2 ms	-14.07%
❌	test_import_time[Runnable]	477.4 ms	544.1 ms	-12.27%
❌	test_import_time[tool]	501.3 ms	600 ms	-16.45%

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32549 will not alter performance

_{Comparing dishaprakash:hybrid-search-pgvectorstore (27b5543) with master (15d558f)}

Summary

✅ 14 untouched

[averikitsch]

Thanks Disha!