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[skip ci] Add note for design doc (#13042) 

Signed-off-by: yhmo <yihua.mo@zilliz.com>
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groot 2021-12-09 11:31:06 +08:00 committed by GitHub
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docs/design_docs/retrieve_entity.md
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In Milvus, a collection has multiple fields, mainly there are two kinds of fields: vector field and scalar field. We call a row as an entity, one entity encapsulates multiple vectors and scalar values. In Milvus, a collection has multiple fields, mainly there are two kinds of 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. When creating a collection, you can specify using the auto-generated primary key, 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. If a user sets to use the user-provided primary key, each entity inserted must contain the primary key field. Otherwise, the insertion fails.
The primary keys will be returned after the insertion request is successful. The primary keys will be returned after the insertion request is successful.