[Proposal] data filtering and aggregation with tags

[Wz]

Hi guys,




To handle multidimensional queries, we plan to implement data filtering and 
aggregation on top of the MPP framework. Here's a description of the scenario: 
https://apache-iotdb.feishu.cn/docx/doxcnOfxK6kYK159X86gxBVFwts




​Any suggestions are welcome. Thanks, Zhong Wang