创建 Scalar Index

支持通过标量索引（Scalar index）加速非向量字段的元数据过滤。Scalar index 类似传统数据库中的索引。

本教程将介绍如何针对数据类型为整数、字符串等的标量字段创建和设置 Scalar index。

自动索引（Auto indexing）

Milvus 能够根据标量字段类型推理索引类型。如需使用自动索引，请在创建索引时省略 index_type 参数。更多有关标量字段数据类型和默认索引算法的对应关系，请参考标量字段索引算法。

以下为示例代码：

Python

# Auto indexing
CLUSTER_ENDPOINT = "YOUR_CLUSTER_ENDPOINT"
TOKEN = "YOUR_CLUSTER_TOKEN"

# 1. Set up a Milvus client
client = MilvusClient(
    uri=CLUSTER_ENDPOINT,
    token=TOKEN 
)

index_params = client.prepare_index_params() # Prepare an empty IndexParams object, without having to specify any index parameters

index_params.add_index(
    field_name="scalar_1", # Name of the scalar field to be indexed
    # highlight-next-line
    index_type="", # Type of index to be created. For auto indexing, leave it empty or omit this parameter.
    index_name="default_index" # Name of the index to be created
)

client.create_index(
  collection_name="test_scalar_index", # Specify the collection name
  index_params=index_params
)

Java

import io.milvus.v2.common.IndexParam;
import io.milvus.v2.service.index.request.CreateIndexReq;

IndexParam indexParamForScalarField = IndexParam.builder()
    .fieldName("scalar_1") // Name of the scalar field to be indexed
    .indexName("default_index") // Name of the index to be created
    // highlight-next-line
    .indexType("") // Type of index to be created. For auto indexing, leave it empty or omit this parameter.
    .build();

List<IndexParam> indexParams = new ArrayList<>();
indexParams.add(indexParamForVectorField);

CreateIndexReq createIndexReq = CreateIndexReq.builder()
    .collectionName("test_scalar_index") // Specify the collection name
    .indexParams(indexParams)
    .build();

client.createIndex(createIndexReq);

NodeJS

await client.createIndex({
    collection_name: "test_scalar_index", // Specify the collection name
    field_name: "scalar_1", // Name of the scalar field to be indexed
    index_name: "default_index", // Name of the index to be created
    // highlight-next-line
    index_type: "" // Type of index to be created. For auto indexing, leave it empty or omit this parameter.
})