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

Status: Open.

#307 In langchain-ai/langchain-postgres;

· miniguezIK opened on May 28, 2026

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

Status: Open.

#304 In langchain-ai/langchain-postgres;

· Stefano (esseti) opened on May 14, 2026

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

Status: Open.

#301 In langchain-ai/langchain-postgres;

· naveen9871 opened on Apr 28, 2026

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

Status: Open.

#300 In langchain-ai/langchain-postgres;

· Dan Peerapatanapokin (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

Status: Open.

#296 In langchain-ai/langchain-postgres;

· primethink-ai opened on Apr 10, 2026

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

Status: Open.

#294 In langchain-ai/langchain-postgres;

· Teh Kok How (khteh) opened on Apr 4, 2026

Instance variable hybrid_search_config‎ incorrectly mutated

Status: Open.

#288 In langchain-ai/langchain-postgres;

· John Trimble (johntrimble) opened on Mar 13, 2026

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

Status: Open.

#281 In langchain-ai/langchain-postgres;

· Yuki Harada (yukiharada1228) opened on Feb 20, 2026

Will there be support for halfvec in future official releases?

Status: Open.

#280 In langchain-ai/langchain-postgres;

· judy-devData opened on Feb 17, 2026

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

Status: Open.

#276 In langchain-ai/langchain-postgres;

· Mr051045 (cs051045) opened on Feb 11, 2026

How to use non-async PGEngine?

Status: Open.

#275 In langchain-ai/langchain-postgres;

· Vincenzo Lavorini (vlavorini) opened on Jan 24, 2026

Separate tables for collections and embeddings in PGVectorStore

Status: Open.

#266 In langchain-ai/langchain-postgres;

· ezequiel-ed-tcmrio (ezequiel-tcmrio) opened on Nov 4, 2025