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core[minor]: Update pgvector transalor for langchain_postgres (#23217)

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The SelfQuery PGVectorTranslator is not correct. The operator is "eq"
and not "$eq".
This patch use a new version of PGVectorTranslator from
langchain_postgres.

It's necessary to release a new version of langchain_postgres (see
[here](https://github.com/langchain-ai/langchain-postgres/pull/75)
before accepting this PR in langchain.
This commit is contained in:
Philippe PRADOS 2024-06-21 16:37:09 +02:00 committed by GitHub
parent 401d469a92
commit 1c2b9cc9ab
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1 changed files with 2 additions and 1 deletions
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3
libs/langchain/langchain/retrievers/self_query/base.py
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@ -170,11 +170,12 @@ def _get_builtin_translator(vectorstore: VectorStore) -> Visitor:
try: try:
from langchain_postgres import PGVector from langchain_postgres import PGVector
from langchain_postgres import PGVectorTranslator as NewPGVectorTranslator
except ImportError: except ImportError:
pass pass
else: else:
if isinstance(vectorstore, PGVector): if isinstance(vectorstore, PGVector):
return PGVectorTranslator() return NewPGVectorTranslator()
raise ValueError( raise ValueError(
f"Self query retriever with Vector Store type {vectorstore.__class__}" f"Self query retriever with Vector Store type {vectorstore.__class__}"