[Bug]: [Nightly] Search result is empty when offset cache and mmap is enabled on bitmap fields

[NicoYuan1986]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version:master(1e75a42)
- Deployment mode(standalone or cluster):cluster
- MQ type(rocksmq, pulsar or kafka):  kafka  
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

Search result is empty when offset cache and mmap is enabled on bitmap fields.

[pytest : test] _______________ TestMixScenes.test_bitmap_offset_cache_and_mmap ________________
[pytest : test] [gw0] linux -- Python 3.8.17 /usr/local/bin/python3
[pytest : test] 
[pytest : test] self = <test_mix_scenes.TestMixScenes object at 0x7f5c4bde7d60>
[pytest : test] request = <FixtureRequest for <Function test_bitmap_offset_cache_and_mmap>>
[pytest : test] 
[pytest : test]     @pytest.mark.tags(CaseLabel.L2)
[pytest : test]     def test_bitmap_offset_cache_and_mmap(self, request):
[pytest : test]         """
[pytest : test]         target:
[pytest : test]             1. enable offset cache and mmap at the same time to verify DQL & DML operations
[pytest : test]         method:
[pytest : test]             1. create a collection with scalar fields
[pytest : test]             2. insert some data and build BITMAP index
[pytest : test]             3. alter all BITMAP fields: enabled offset cache and mmap
[pytest : test]             4. load collection
[pytest : test]             5. query the data of `not exist` primary key value
[pytest : test]             6. upsert the `not exist` primary key value
[pytest : test]             7. re-query and check data equal to the updated data
[pytest : test]             8. delete the upserted primary key value
[pytest : test]             9. re-query and check result is []
[pytest : test]             10. search with compound expressions and check result
[pytest : test]         expected:
[pytest : test]             1. DQL & DML operations are successful and the results are as expected
[pytest : test]         """

[pytest : test]         # search
[pytest : test]         nq, limit = 10, 10
[pytest : test] >       self.collection_wrap.search(
[pytest : test]             data=cf.gen_field_values(self.collection_wrap.schema, nb=nq).get(DataType.FLOAT_VECTOR.name),
[pytest : test]             anns_field=DataType.FLOAT_VECTOR.name, param={"metric_type": MetricType.L2, "ef": 32}, limit=limit,
[pytest : test]             expr=Expr.AND(Expr.GT(Expr.SUB('INT64', 37).subset, 13), Expr.LIKE('VARCHAR', '%a')).value,
[pytest : test]             output_fields=scalar_fields, check_task=CheckTasks.check_search_results,
[pytest : test]             check_items={"nq": nq, "ids": insert_data.get(DataType.INT64.name), "limit": limit,
[pytest : test]                          "output_fields": scalar_fields})

[pytest : test] [2024-10-28 19:46:44 - DEBUG - ci_test]: (api_request)  : [Collection.search] args: [[[0.09713405539327369, 0.5066779386978854, 0.5090902986938205, 0.7053385087798683, 0.713152474205256, 0.3535995715273804, 0.2790209611696892, 0.6133601998113679, 0.5335821814453854, 0.48070516243413985, 0.5564753198302369, 0.8493031111991776, 0.05494459948201935, 0.26953052554140433, 0.259476505375......, kwargs: {} (api_request.py:62)
[pytest : test] [2024-10-28 19:46:45 - DEBUG - ci_test]: (api_response) : data: ['[]', '[]', '[]', '[]', '[]', '[]', '[]', '[]', '[]', '[]']  (api_request.py:37)
[pytest : test] [2024-10-28 19:46:45 - INFO - ci_test]: search_results_check: checking the searching results (func_check.py:307)

Expected Behavior

search result is not empty

Steps To Reproduce

No response

Milvus Log

1. link: https://jenkins.milvus.io:18080/blue/organizations/jenkins/Milvus%20Nightly%20CI(new)/detail/master/162/pipeline/114/
2. log: artifacts-milvus-distributed-kafka-mdk-master-162-py-n-162-e2e-logs.tar.gz
3. error case: test_bitmap_offset_cache_and_mmap

Anything else?

No response

[yanliang567]

/assign @zhagnlu
/unassign