Why use both LanceDB and Parquet?

[nileshtrivedi]

I just noticed that graphrag creates a directory lancedb outside of ragtest. LanceDB is a columnar data format for ML and pitches itself as an alternative to Parquet.

Is there a reason why GraphRAG needs both of these?

[natoverse]

Parquet is used for general storage, lancedb is used for vector search, so only the embeddings are loaded there.