[Issue #55]: reduce memory copy in column readers.#56

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bianhq merged 4 commits intopixelsdb:masterfrom

bianhq:ISSUE-55

Jan 5, 2020

Commits on Jan 3, 2020

[Issue #55]: reduce memory copy in double and float and timestamp column reader.
bianhq
committed

Commits on Jan 4, 2020

[ISSUE-55]: reduce memory copy in StringColumnReader.
bianhq
committed

Commits on Jan 5, 2020