iotdb
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Currently, the package organization of Query Filter in TsFile is chaotic.
I draw the package diagram as follows:

-
why there are two clusters of FILTER?
Operator,Expressionare better as their names. -
why there are two
AndandOrclasses?
Originally posted by @jixuan1989 in https://github.com/thulab/iotdb/pull/476/comment#issuecomment-443077191