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[skip ci] Add note for design doc (#12861) 

Signed-off-by: yhmo <yihua.mo@zilliz.com>
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groot 2021-12-07 12:07:50 +08:00 committed by GitHub
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docs/design_docs/retrieve_entity.md
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## Background
In Milvus, one entity encapsulates multiple vectors and scalars.
In Milvus, a collection has multiple fields, mainly there are two kinds fields: vector field and scalar field. We call a row as an entity, one entity encapsulates multiple vectors and scalar values.
When creating a collection, you can specify using the primary key generated automatically, or using the user-provided primary key.
If a user sets to use the user-provided primary key, each entity inserted must contain the primary key field. Otherwise, the insertion fails.