[Bug]: Minio chunk manager GetObject return null value in macOs

[zhagnlu]

Is there an existing issue for this?

• I have searched the existing issues

Environment

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

Current Behavior

When use c++ minio chunk manager, GetObject interface return null.

Expected Behavior

GetObject return real value

Steps To Reproduce

1. use disk-ann index when use macOs
2. GetObject return null values.

Milvus Log

No response

Anything else?

the reason:
for reduce memory copy, use ourself buffer to get body from server like:

however, stringstream->pubsetbuf has different implement for different system base library.
for linux:

actually use new buffer to replace origin.

but for mac:

not implement stringstream setbuf interface, and using basic_streambuf which just return, so it can not use our buffer.

[yanliang567]

/assign @zhagnlu
/unassign

[stale]

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