Feature/8 support pg dump#23

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mnc wants to merge 7 commits intomasterfrom

feature/8-support-pg-dump

Commits on Mar 3, 2019

add maskdump/dump
mnc
committed

Commits on Mar 10, 2019

Commits on Mar 15, 2019

Commits on Mar 16, 2019

modify copy statement rule logic bug.
mnc
committed