Indexing on nested field in Azure Cosmos DB

问题

I want to create an index on a nested field in a document in Azure Cosmos DB. E.g. if I have the following schema:

{ 
    'id': 1, 
    'nested': 
        { 
            'mode': 'mode1',
            'text': 'nice text' 
        } 
}

I want to create an index on the field nested.mode. How can this be done?

回答1:

By default, all paths are indexed in Cosmos DB. To index just "nested.mode", you need to specify an indexing policy on the /nested/mode/? path with the appropriate data type/precision. Something like this in JSON within the includedPaths section.

     "path":"/nested/mode/?",
     "indexes":[
        {
           "kind":"Range",
           "dataType":"String",
           "precision":-1
        }

More details here: https://docs.microsoft.com/en-us/azure/cosmos-db/indexing-policies.

来源：https://stackoverflow.com/questions/49049907/indexing-on-nested-field-in-azure-cosmos-db