Currently, when filtering a column, a new column will be created to store the filtering result, which will cause some performance loss。 ssb-flat without pushdown expr from 19s to 15s.
Issue Number: close#16351
Dynamic schema table is a special type of table, it's schema change with loading procedure.Now we implemented this feature mainly for semi-structure data such as JSON, since JSON is schema self-described we could extract schema info from the original documents and inference the final type infomation.This speical table could reduce manual schema change operation and easily import semi-structure data and extends it's schema automatically.
