Tracking issue: table cluster key

[zhyass]

Cluster key is to organize the storage of data to better suit expected queries. The goals are to improve query performance whilst reducing the system resources required to execute queries.

#4268

clustering

• Feature: optimize table recluster #6857
• Add cluster key statistics in block meta #5194
• bug: clustering key does not take effect in cluster mode  #5473

syntax

• feat(query): support cluster key in fuse engine #4999
• feat(query): alter table cluster key #5718
• feat(query): support drop cluster key #5835
• feat(fuse): add system$clustering_information function #5426

task

• Feature: add expression valid check for cluster key #5861
  - [ ] Add virtual columns to fuse engine #5326

[Xuanwo]

All tasks have been finished. Let's close.