Bugfix/create postgresql table if not exists for vectorstore

[HenryHengZJ]

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[gemini-code-assist]

Summary of Changes

Hello @HenryHengZJ, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the PostgreSQL vector store integration by introducing robust support for database schemas and ensuring the automatic creation of the vector store table and the essential pgvector extension. These changes address potential issues where the table might not exist, thereby streamlining the setup and usage of PostgreSQL vector stores and improving overall reliability.

Highlights

• Schema Support: Added functionality to specify and utilize a PostgreSQL schema for vector store tables, allowing for better organization and isolation of data.
• Automatic Table Creation: Implemented logic to automatically create the PostgreSQL vector store table and the necessary pgvector extension if they do not already exist when documents are added, preventing runtime errors.
• Refactored Table Path Handling: Centralized the logic for constructing the full table path (including schema) within the VectorStoreDriver to improve consistency and maintainability across the codebase.

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[gemini-code-assist]

Code Review

This pull request introduces a bugfix to ensure that the PostgreSQL table for the vector store is created if it doesn't exist, and adds support for specifying a schema. The changes are well-implemented, introducing helper methods for schema and table path construction, and a new method to handle database object creation (ensureTableInDatabase). My main feedback is a performance consideration regarding where this check is performed. I've left a specific comment on how to improve this.