how does llama index query the redis, KNN or Range, what command does it use?

[johnhu33]

how does llama index query the redis, KNN or Range, what command does it use?

[dosubot[bot]]

LlamaIndex queries Redis using KNN (k-nearest neighbors). The command it uses is:

base_query = f"{filters}=>[KNN {top_k} @{vector_field} $vector AS vector_score]"

This command is part of the get_redis_query function, which constructs a vector query for use with a SearchIndex. LlamaIndex supports two types of vector indexes in Redis: FLAT (brute force search) and HNSW (hierarchical navigable small world graph index).

Additionally, LlamaIndex also supports querying using range filters. The _metadatafilter_to_dict function converts range filters into a dictionary format that can be used in the query. The _search_query_with_filter function constructs a search query with pre-filter or post-filter options, allowing for more complex querying capabilities ^[1][2][3].

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