[Bug]: Getting sparse vector value returns byte encrypted array

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Current Behavior

When I run this code to get the content of a sparse float vector:

searchResult.Fields.GetColumn("sparse_vector_column").FieldData().GetVectors().GetSparseFloatVector().GetContents()

I get:

["GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAADXo1A/","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAADXo1A/","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAABcj0I/","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAAAMAis/","QwEAAAAAgD9EAQAAAACAP2gBAAAAAIA/YAIAAAAAgD97AgAAAACAP4cCAAAAAIA/iQIAAAAAgD8hAwAAAACAPyIDAAAAAIA/IwMAAB1aJD8=","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAADjpRs/","QwEAAAAAgD9EAQAAAACAP2sBAAAAAIA/YAIAAAAAgD97AgAAAACAP4cCAAAAAIA/iQIAAAAAgD8hAwAAAACAPyIDAAAAAIA/IwMAAB+FGz8=","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD9rAQAAAACAP2ACAAAAAIA/ewIAAAAAgD+HAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAACamTk/","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD9rAQAAAACAP2ACAAAAAIA/ewIAAAAAgD+HAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAAAMAis/","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD+IAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAADRIts+","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD9JAQAAAACAP2sBAAAAAIA/bQEAAAAAgD91AQAAAACAP10CAAAAAIA/YAIAAAAAgD93AgAAAACAP3sCAAAAAIA/hgIAAAAAgD+HAgAAAACAP4kCAAAAAIA/IQMAAAAAgD8iAwAAAACAPyMDAAArhxY/","QwEAAAAAgD9EAQAAAACAP2sBAAAAAIA/YAIAAAAAgD97AgAAAACAP4cCAAAAAIA/iQIAAAAAgD8hAwAAAACAPyIDAAAAAIA/IwMAAC/dpD4=","GwEAAAAAgD82AQAAAACAP0IBAAAAAIA/RAEAAAAAgD9ZAQAAAACAP2sBAAAAAIA/YAIAAAAAgD97AgAAAACAP4cCAAAAAIA/iQIAAAAAgD8hAwAAAACAPyIDAAAAAIA/IwMAAD0Klz4="]

Expected Behavior

This should return me a hashmap of an integer to float32 value mapping.

Steps To Reproduce

No response

Environment

No response

Anything else?

No response

FieldData() used to get result proto data，so you will get the source data like []byte

Usually we could get colum data like hits.Fields.GetColumn("pk").GetAsInt64(id) but now we seems lack GetAsSparseVector.

Maybe you can get sparse data by

vector, err := hits.Fields.GetColumn("vector").Get(id)
if err != nil {
    return err
}
sparse,ok:= vector.(entity.SparseEmbedding)

vectorColumn := hits.Fields.GetColumn("vector").(*entity.ColumnSparseFloatVector)
sparse, err := vectorColumn.ValueByIdx(idx)
if err != nil {
    return err
}

But now SparseEmbedding only support get position and value by index, not return a map.

Seems we should complete GetSparseVector for Column and add Mapping method for SparseEmbedding.

milvus-io / milvus-sdk-go