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What will happen if you pass an empty list of queries to MultiQueryRetriever and call get_relevant_documents?

medium📝 component behavior Q5 of 15
LangChain - RAG Chain Construction
What will happen if you pass an empty list of queries to MultiQueryRetriever and call get_relevant_documents?
AIt returns all documents from the base retriever.
BIt raises a ValueError for missing queries.
CIt returns an empty list immediately.
DIt returns None.
Step-by-Step Solution
Solution:

  1. Step 1: Check behavior with empty queries

    When no queries are provided, MultiQueryRetriever defaults to retrieving all documents from the base retriever.

  2. Step 2: Eliminate other options

    No error is raised, and it does not return empty or None but all documents.

  3. Final Answer:

    It returns all documents from the base retriever. -> Option A

  4. Quick Check:

    Empty queries return all docs = A [OK]
Quick Trick: Empty queries fetch all documents by default [OK]
Common Mistakes:
  • Expecting an error on empty queries
  • Thinking it returns empty list
  • Assuming it returns None

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