it's called modified hourglass model or hourglass model in a stick:
account dimension
time dimension
largest dense dimension
smallest dense dimension
smallest sparse dimension
largest sparse dimension
non-aggregate sparse dimension
this is due to
1) read block into memory is resource-consuming
2) search a block in index file is resource-consuming
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/8583032/viewspace-717131/ ，如需转载，请注明出处，否则将追究法律责任。
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planning model
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