langchain-postgres

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Description: Add support to filter by IS NULL criteria in the metadata Issue: N/A Dependencies: N/A Twitter handle: @martinferenaz This PR fixes the problem when you want to search if...

MartinGotelli

Error while upgrading psycopg2 to psycopg with "from langchain_postgres import PGVector" and "langchain_postgres.vectorstores import PGVector"

2

### Checked other resources - [X] I added a very descriptive title to this issue. - [X] I searched the LangChain documentation with the integrated search. - [X] I used...

rkrkrediffmail

Add async mode for pgvector

4

This PR adds the **async** approach for pgvector. Some remarks: - We use assert to check invocations and not if. Thus, in production, it is possible to remove these checks...

pprados

create a mechanism to migrate from community vectorstore to this implementation

3

electricjimi

PostgresChatMessageHistory API break the usage of LCEL and Langserv

4

The constructor of `PostgresChatMessageHistory` accepts only sync or async connection, and not an Engine. First, the connection was open in get_session_history, and pending during the life cycle of `RunnableWithMessageHistory`. So,...

pprados

Error while trying to import psycopg with poetry

2

This is the error message I got: ``` - couldn't import psycopg 'c' implementation: No module named 'psycopg_c' - couldn't import psycopg 'binary' implementation: No module named 'psycopg_binary' - couldn't...

FilippoFlorindiKAI

Error while indexing

4

Hello, I was getting the following error while indexing my embeddings onto PGVector. It did not throw such errors when I was using the old langchain-community implementation. Wondering if the...

Sachin-Bhat

`CREATE EXTENSION` fails with Azure Cosmos DB for PostgreSQL

1

The SQL for enabling the `vector` extension is hardcoded at https://github.com/langchain-ai/langchain-postgres/blob/07053067c7013b4b57c035f6caa94b2b63bfe404/langchain_postgres/vectorstores.py#L344 But when using Azure Cosmos DB for PostgreSQL, it's necessary to use `SELECT create_extension('vector');` From [relevant docs](https://learn.microsoft.com/en-us/azure/cosmos-db/postgresql/reference-extensions): ``` If...

joshuasundance-swca

metadata equality filter loss of performance

1

in previous versions of the langchain postgres implementation i was able to get sub-second latency on queries that filtered by a string id in the embedding metadata ... something like,...

galtay-tempus

Potential solutions for being able to index different vector sizes?

8

Curious if anyone was thinking about re-writing the table schemas such that collections map to different tables (and would therefore support indexing different embedding vector sizes) ? ``` embedding_length: The...

galtay-tempus