Some issues regarding queries when both raw data and downsampled data exist simultaneously

[yuyue67]

I constructed raw data for the time range 9:00-11:00 and downsampled data for the time range 9:00-10:00, placing them locally for Thanos to read. When I use query_range to query with a begin time of 9:00 and an end time of 11:00, during debugging, I found that there are three chunks of data in the AggrChunk, as follows（goland debug）:
chunks{[]storepb.AggrChunk}:
[0]
MinTime : 1587690005791 （9:0:5）
MaxTime : 1587693545791 (9:59:5)
Raw : .....
[1]
MinTime : 1587690299999（ 9:4:59 ）
MaxTime : 1587693590791 (9:59:50)
Count : .....
Sum : .....
[2]
MinTime : 1587693605791（10:0:5）
MaxTime : 1587697145791 (10:59:5)
Raw : .....

This may pose some issues, as the purpose of downsampling is to reduce the number of data points in memory. In the current use case, both the raw data and the downsampled data are being loaded, which may raise concerns about potential problems.