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In some scenarios, users want to delete some entities from a collection that will no longer be searched out. Currently, users can only manually filter out unwanted entities from search results. We hope to implement a new function that allows users to delete entities from a collection.
Public Interfaces
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| language | py |
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& Behavior
Delete API can be used to delete entities in the collection, and the deleted entities will no longer appear in the results of the Query and Search request.
`collection_name` is the name of colletion to delete entities from.
`expr` is an expression indicated whether an entity should be deleted in the collection. Only the `in` operator is supported in the Delete API. Document of expression: https://github.com/milvus-io/milvus/blob/master/docs/design_docs/query_boolean_expr.md
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`partition_name`
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is
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the
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name
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of
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partition
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to
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delete
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entities
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from,
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`None`
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means
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all
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partition.
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`Delete`
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returns
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after
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being
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written
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into
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the
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insert
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channel,
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which
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means
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the
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delete
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request
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has
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been
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reliably
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saved
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and
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will
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be
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applied
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in
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search/query
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requests.
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The
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type
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of
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return
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value
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is
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MutationResult,
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which
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contains
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several
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properties,
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and
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only
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`_primary_keys`
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will
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be
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filled.
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Same
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as
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Insert
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API,
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Milvus
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only
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guarantee
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the
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visibility
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of
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operations
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with
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a
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client.
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This
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means
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that,
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within
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the
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sequence
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of
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the
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operations
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"delete(),
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search()",
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the
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result
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of
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the
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search
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will
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not
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contains
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the
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entities
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deleted.
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Since different clients connect to different Proxy, the time between different Proxy is not exactly th same. So even if you manually call the delete method and the search method on two clients sequentially, it is uncertain whether the search request returns the deleted entities.
Currently, Milvus does not support dedup in inserting, so the delete operation will delete all satisfied entities.
Delete a non-existent entity is not an error, so delete() will not raise an Error.
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def delete(self, collection_name, expr, partition_name=None, timeout=None, **kwargs)->MutationResult:
"""
Delete entities with an expression condition.
And return results to show which primary key is deleted successfully
:param collection_name: Name of the collection to delete entities from
:type collection_name: str
:param expr: The query expression
:type expr: str
:param partition_name: Name of partitions that contain entities
:type partition_name: str
:param timeout: An optional duration of time in seconds to allow for the RPC. When timeout
is set to None, client waits until server response or error occur
:type timeout: float
:return: delete request executed results.
:rtype: MutationResult
:raises:
RpcError: If gRPC encounter an error
ParamError: If parameters are invalid
BaseException: If the return result from server is not ok
""" |
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