schemaStorage: reduce memory usage and add unit tests (#1115)#1127

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ti-srebot merged 2 commits intopingcap:release-4.0from ti-srebot:release-4.0-c852d053296e

Nov 26, 2020

+271-27

Commits on Nov 26, 2020

cherry pick pingcap#1115 to release-4.0

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