query()

This method conducts a vector query in a specified partition.

Invocation

query(expr, output_fields=None, timeout=None, **kwargs)

Parameters

Parameter	Description	Type	Required
`expr`	Boolean expression to filter the data.	String	True
`output_fields`	List of names of fields to output.	list[String]	False
`timeout`	An optional duration of time in seconds to allow for the RPC. If it is set to None, the client keeps waiting until the server responds or error occurs.	Float	False
`kwargs`: `consistency_level`	Consistency level used in the search.	String/Integer	False
`kwargs`: `guarantee_timestamp`	Milvus searches on the data view before this timestamp when it is provided. Otherwise, Milvus searches on the most updated data view. This parameter can only be used in the `Customized` level of consistency.	Integer	False
`kwargs`: `graceful_time`	Milvus will use current timestamp minus the `graceful_time` as the `guarantee_timestamp` for search. This parameter can only be used in the `Bounded` level of consistency.	Integer	False
`kwargs`: `travel_timestamp`	Timestamp that is used for Time Travel. Users can specify a timestamp in a search to get results based on a data view at a specified point in time.	Integer	False

Return

A list that contains all results.

Raises

RpcError: error if gRPC encounter an error.
ParamError: error if the parameters are invalid.
BaseException: error if the return result from server is not ok.

Example

from pymilvus import Partition
partition = Partition("novel")
res = collection.query(
  expr = "book_id in [2,4,6,8]", 
  output_fields = ["book_id", "book_intro"],
  consistency_level="Strong"
)
sorted_res = sorted(res, key=lambda k: k['book_id'])
sorted_res