Issues

• Hybrid search mutates the caller's HybridSearchConfig, so later searches reuse the first query for keyword search

  langchain-ai/langchain-postgres#337 · Filter by author ecomlisters opened on Sep 21, 2026
  1

• Race condition on CREATE EXTENSION vector in PGEngine (missing advisory lock)

  langchain-ai/langchain-postgres#329 · Filter by author yukiharada1228 opened on Sep 12, 2026
  2

• Version Constraint Issue: langchain-postgres 0.0.17 + pgvector >=0.4.2

  langchain-ai/langchain-postgres#307 · Filter by author miniguezIK opened on May 28, 2026

• Similarity search with distance filter failed: (psycopg.errors.UndefinedColumn) column "product_ids" does not exist

  langchain-ai/langchain-postgres#304 · Filter by author esseti opened on May 14, 2026
  2

• Bug: v2 AsyncPGVectorStore fails with mixed-case column names due to unquoted identifiers in adelete and filters

  langchain-ai/langchain-postgres#301 · Filter by author naveen9871 opened on Apr 28, 2026

• Bug: PGVector.add_documents/add_embeddings silently truncates documents via zip and falsely reports all IDs as inserted

  langchain-ai/langchain-postgres#300 · Filter by author pongpatapee opened on Apr 27, 2026

• psycopg (LGPL-3.0) is eagerly imported at package load, making it impossible to use only the v2 driver-agnostic API

  langchain-ai/langchain-postgres#296 · Filter by author primethink-dem opened on Apr 10, 2026

• What are the tables created for with some of them being empty?

  langchain-ai/langchain-postgres#294 · Filter by author khteh opened on Apr 4, 2026

• Instance variable hybrid_search_config‎ incorrectly mutated

  langchain-ai/langchain-postgres#288 · Filter by author johntrimble opened on Mar 13, 2026

• Support metadata-only update operations in PGVectorStore (design discussion)

  langchain-ai/langchain-postgres#281 · Filter by author yukiharada1228 opened on Feb 20, 2026
  1

• Will there be support for halfvec in future official releases?

  langchain-ai/langchain-postgres#280 · Filter by author judy-devData opened on Feb 17, 2026

• AsyncPGVectorStore.as_retriever filter in search_kwargs is not translated to target langchain_metadata column

  langchain-ai/langchain-postgres#276 · Filter by author cs051045 opened on Feb 11, 2026
  2

• How to use non-async PGEngine?

  langchain-ai/langchain-postgres#275 · Filter by author vlavorini opened on Jan 24, 2026
  1

  

• Separate tables for collections and embeddings in PGVectorStore

  langchain-ai/langchain-postgres#266 · Filter by author ezequiel-tcmrio opened on Nov 4, 2025
  2

• support VectorChord (postgresql)

  langchain-ai/langchain-postgres#265 · Filter by author ghost opened on Nov 2, 2025

• Updating reference docs for new site

  langchain-ai/langchain-postgres#259 · Filter by author mdrxy opened on Oct 10, 2025
  1

• PGVectorStore faild with AzureAIEmbeddingsModel (Document objects could not be iterable)

  langchain-ai/langchain-postgres#253 · Filter by author pccr-ai opened on Sep 20, 2025
  1

  

• Add Question-Level Caching to LangChain for RAG Pipelines

  langchain-ai/langchain-postgres#252 · Filter by author bharatht19 opened on Sep 18, 2025

• PGVectorStore fails with GoogleGenerativeAIEmbeddings

  langchain-ai/langchain-postgres#247 · Filter by author sergiocharpineljr opened on Aug 20, 2025
  6

  

• Suggestion: init_vectorstore_table() should also create the schema

  enhancement
  langchain-ai/langchain-postgres#240 · Filter by author gardner opened on Aug 2, 2025
  2

• [PGVector] Unnecessary columns queried leads to high latency

  langchain-ai/langchain-postgres#237 · Filter by author JoshuaPostel opened on Jul 24, 2025
  1

• adelete does not delete embeddings

  langchain-ai/langchain-postgres#225 · Filter by author LuchiLucs opened on Jun 26, 2025
  1

• Correct usage

  langchain-ai/langchain-postgres#182 · Filter by author diego-lipinski-de-castro opened on Apr 7, 2025

• Store initialization race condition - Table 'langchain_pg_collection' is already defined for this MetaData instance

  langchain-ai/langchain-postgres#165 · Filter by author MartinGotelli opened on Feb 26, 2025
  4

• filter with $like

  langchain-ai/langchain-postgres#159 · Filter by author gesaleh opened on Jan 30, 2025