Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain.js documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain.js rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

libs/langchain-google-cloud-sql-pg/src/vectorstore.ts:368

class PostgresVectorStore extends vectorstores_1.VectorStore {
             delete allColumns[contentColumn];
             delete allColumns[embeddingColumn];
             allMetadataColumns = Object.keys(allColumns);
+        } else {
+            for (const column of metadataColumns) {
+                if (Object.prototype.hasOwnProperty.call(allColumns, column)) {
+                    allMetadataColumns.push(column);
+                }
+            }
         }
         return new PostgresVectorStore(embeddings, {
             engine,

Error Message and Stack Trace (if applicable)

No response

Description

When using the PostgresVectorStore with explicitly specified metadata columns, the system was not properly handling these columns. The code was only processing metadata columns when they weren't explicitly provided, which could lead to missing or incomplete metadata in the vector store operations.

System Info

langchain@0.3.27 | MIT | deps: 12 | versions: 322
Typescript bindings for langchain
https://github.com/langchain-ai/langchainjs/tree/main/langchain/

keywords: llm, ai, gpt3, chain, prompt, prompt engineering, chatgpt, machine learning, ml, openai, embeddings, vectorstores

dist
.tarball: https://registry.npmjs.org/langchain/-/langchain-0.3.27.tgz
.shasum: e0ed686765dba3809f90a214110bee445cf240a8
.integrity: sha512-XfOuXetMSpkS11Mt6YJkDmvuSGTMPUsks5DJz4RCZ3y2dcbLkOe5kecjx2SWVJYqQIqcMMwsjsve3/ZjnRe7rQ==
.unpackedSize: 2.9 MB

dependencies:
@langchain/openai: >=0.1.0 <0.6.0
@langchain/textsplitters: >=0.0.0 <0.2.0
js-tiktoken: ^1.0.12
js-yaml: ^4.1.0
jsonpointer: ^5.0.1
langsmith: ^0.3.29
openapi-types: ^12.1.3
p-retry: 4
uuid: ^10.0.0
yaml: ^2.2.1
zod-to-json-schema: ^3.22.3
zod: ^3.22.4

maintainers:

• nfcampos nuno@boringbits.io
• jacoblee93 jacoblee93@gmail.com
• andrewnguonly andrewnguonly@gmail.com
• davidduong david@duong.cz
• hwchase17 hw.chase.17@gmail.com
• basproul braceasproul@gmail.com

dist-tags:
latest: 0.3.27
next: 0.3.2-rc.0
tag-for-publishing-older-releases: 0.2.20

published 2 weeks ago by benjamincburns benjamin.c.burns@gmail.com