If we want to support the expr of key, the different load plan will be need
between base and rollup.
The key of rollup needs to be transformed by the to_mouth function before
the storage engine aggregate the value column.
>From the perspective of demand, users only need to be able to store day,
mo
yanyin 将撤回邮件“”。
If expressions are supported, the storage engine will changed when the
function column is built automatically.
Also the mv selector need a expression calculation tool to judge whether mv
could be selected for query.
After Doris support the count_distinct and count, I will consider this
feature.
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