Advanced Retrieval Pattern Selection | Strategy | Match Unit | Return Unit | Best For | |---|---|---|---| | Parent-document | Small child chunk | Parent chunk | Need precision + context | | Small-to-big | Sentence | Window around match | Dense prose, legal | | Multi-vector (summary) | LLM summary | Original chunk | Heterogeneous docs, dense tech | | Multi-vector (hypothetical Q) | Generated Q | Original chunk | FAQ-style queries | | Sentence-window | Sentence | ±N sentences | Narrative, conversations | | Auto-merging | Leaf node | Merged parent if threshold met | Structured hierarchies | | RA…